9. Back　　A good host is hospitable to his guests. But, if guest is tiresome, the host is glad to see his back (他离开).　　If your friend has done something really well, you may give him a pat on the back (轻轻拍背部) to show your appreciation.　　If you turn your back on somebody (不理睬他人), you mean you do not like making friends with that person.

　　10. Heart　　The heart is an extremely important organ inside the chest. It usually stands for something important or the centre of something, for example, the heart of the matter (问题的核心) or the heart of mystery.　　Many other expressions make use of the word heart. A lover can be called a sweet heart (情人). The Purple Heart (紫心徽章) is a medal given as an honor to American soldiers wounded in battle.　　If your friend is in trouble, you may encourage him by saying "Don't lose heart (不要灰心)."　　　　11. Stomach　　The stomach is naturally related to one's appetite. If you dislike heavy food, you have no stomach for it (反胃). The word is also related to one's interests or likings. If you find something boring or vulgar, you have no stomach for it, either. Bad food turns your stomach. Similarly, your stomach turns at a bad joke.　　Stomach can also be a verb. Look at this example: "How could you stomach (忍受) such rude words?" Apparently, stomach here can be replaced by "tolerate".

　　12. Arm　　Every person has two arms: the right arm and the left arm. The right arm is usually stronger, so we call a good helper the right arm (得力助手).　　We all know an arm is not very long. But when you keep someone at arm's length (保持距离), the distance is long enough. For that means you don not like that person and you try your best to avoid him or her. We should indeed keep the bad friends at arm's length.　　　　13. Hand　　Quite a number of phrases formed form the word hand are very similar to their Chinese counterparts. Here are some obvious examples: a fresh hand (新手), short of hands (人手短缺), hand in hand (手拉手) and wash one's hands of something (洗手不干了). But do not always take this for granted. Study these examples and you will understand.

　　14. Finger　　How many fingers does each of your hands have? Now let's name them in English from the smallest: the little finger, the ring finger, the middle finger, the index finger and thumb.　　Each finger has its own part to play. If your fingers are all thumbs (笨拙), that is too bad. That means you are very clumsy.　　　　15. Thumb　　Chinese people turn up their thumbs to express appreciation. English people do so to express not only appreciation but also approval. Chinese people never turn their thumbs down to mean anything. But English people do. They do so to show depreciation disapproval. Thus in English you can say, "We turn thumbs up (赞成) to Jack's suggestion but they turn thumbs down (不赞成) to it."　　Similarly, you can warmly praise someone by saying "Thumbs up (真棒)!" and show your dissatisfaction by saying "Thumbs down (差劲)!"

　　16. Skin 　　 Most people will only think of the hair on our head when the word hair is mentioned. In fact, some animals and plants also have hair.　　A horrible scene may make a person's hair stand on end (毛骨悚然). But a courageous person will not turn a hair (不畏惧) even though he is in face of danger.　　Sometimes, a friend of yours may be so angry that he may act foolishly. Then you had better give him this advice: "Keep your hair on (别发脾气)".

　　时间time 　　 in 　　 in 1999, in 20 century, in a flash(瞬时), in a lucky hour(在幸运时刻), in a minute, in a second, in a short time, in a while, in a wink(一瞬间) in advance(预先), in an emergency(在紧急地时候), in an evil hour(在不幸地时刻), in an instant, in ancient times, in broad day(在大白天), in course of, (在…期间), in December, in due course(及时地), in future, in good season(及时地), in no time(马上), in one's childhood, in one's spare time, in one's teens, in one's youth, in recent years, in season(适时), in seconds(在很短的时间), in some cases(有时候), in spring, in the afternoon, in the beginning, in the daytime, in the end, in the evening, in the future, in the long run(最后), in the meantime, in the morning, in the nick of time(在紧急关头), in the night, in the past, in the thick of (在最激烈的时刻), in the thick of(在最激烈的时刻), in this period, in those days, in time of war, in time，

　　 　　地点place 　　 in 　　 in a car, in a queue, in advance of (在…前面), in all the direction, in appearance, in corners(在角落里) in doors, in front (of), in good light(在光线好的地方), in heaven, in place(position)(在适当地位置), in places(处处), in port(在港内), in public places, in shore(靠岸), in society, in the air(在空中) in the bank, in the book(书的内容里), in the centre(在中央), in the countryside, in the distance(在远处那边), in the east of(在…东部) in the east, in the fields, in the film, in the front rank(在前列), in the front row, in the lab, in the letter(信的内容), in the middle of, in the moonlight, in the newspaper(报纸的内容里), in the open air(在户外), in the open(在野外), in the picture, in the rain, in the room, in the shade of, in the sky, in the suburbs of, in the sunshine, in the tree, in the universe, in the vicinity of(在附近), in the warm(在暖和的地方) in the world, in(on) the bus, in(on) the street,

　　on 　　 on board (在船上) on camera(出现在电视上), on campus, on deck(在甲板上), on earth, on high(在高处), on land, on the bank, on the beach, on the borders, on the ceiling, on the coast, on the committee, on the corner(在拐角处), on the east of(在…的东面) on the farm, on the first floor, on the football field, on the (play)ground, on the horizon, on the island, on the left/right,. on the market, on the page 12, on the railway line, on the river, on the road, on the roof, on the sea, on the shore, on the side of, on the team, on the track(在轨道上), on the water(在水面上), on top of, on(in) the wall,

　　at 　　 at a bookshop, at a distance(在远处), at that place, at the airport, at the back of, at the base of, at the bottom of, at the centre (of)(在中心), at the corner, at the crossroads, at the desk(在书桌旁), at the door, at the edge of, at the end of, at the foot of, at the front, at the gate, at the head of, at the meeting, at the mine(在矿山), at the party, at the place, at the pub, at the rear of, at the seaside, at the station, at the stop, at the top of, at the window, at(in) the cinema, at(in) the library, at(in) the office, at(in) the village, at(on) the weekend

　　on 　　 on a diet(在节食), on a picnic, on a trip, on a vacation trip, on a visit, on a voyage, on a walk, on approval, on bended knees(跪着) on business, on call (待命) on credit(赊帐), on display, on drill(在训练), on duty, on exhibition, on fire, on foot, on good terms(友好), on guard, on hire(出租) on holiday, on leave, on loan(出借), on offer(出售中), on one's day(在最兴旺的日子), on one's guard(警惕) on one's honeymoon, on one's knees, on one's mind(惦念), on one's own time(在非工作时间), on one's round(出诊) on order(已订购), on parade(在游行), on patrol(巡逻) on sale(待售) on sale, on show, on stream(在生产中) on the air(在广播), on the alert(提防), on the ebb(在退潮), on the feed(在进食), on the fly(在飞行中), on the increase/decrease(在增长/下降中), on the job(工作着) on the listen(在注意听), on the lurk(暗中行动), on the march(行军中), on the move(在活动中) on the phone(在打电话) on the quiet(秘密地) on the rise(在上涨), on the run(跑这), on the spot(在危险中，当场), on the strike, on the turn(在转变中) on the watch(守侯着), on the way(在途中), on the way, on tour, on trial, on vacation, on view(展览着), on watch(值班),

　　at 　　 at a disadvantage(处不利地位), at a lecture, at a run(跑着), at breakfast, at call(随叫随到), at church, at dinner, at ease(悠闲自得), at feed, at gaze, at grass， at graze,(在吃草) at hand(在手边), at high/low(处于高潮/低潮中), at issue(在争论中), at large(未被捕), at leisure (空闲着), at meals, at peace, at play, at rest, at school, at stake(处在危险中), at study, at table(在吃饭), at the bar(受到公开审问), at the meeting, at the piano, at the wheel(在驾车), at war, at work，