1.在一只两头封闭的纸板圆柱筒一端的盖子当中，剪出一个直径为1/2英寸的圆孔。
2.通过圆孔，吹进几口烟，把圆筒平放，用指节慢慢地轻拍纸筒底面，一个个烟圈从孔里喷出。
3.点上一支蜡烛，用这圆筒做的炮对准烛焰，在筒底轻拍一、二下，只要对得准，有时3英尺以上的烛焰也能熄灭。
感觉这个应该有英语原文，但怎么也找不到。。搜的关键词基本是：cylinder smoke 3 feet candle flame extinguish
哪位大神帮帮学渣吧，最好找到原文，或者对其原理给点意见

挽尊
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1 in the lid of a two closed cardboard cylinder end, cut a hole with a diameter of 1\/2 inch.The 2 through hole, blowing a few smoke, a cylinder made of flat, slowly pat the tube bottom knuckle, a smoke ring is ejected from the hole.3 the candle, the cylinder do gun on candle flame, at the bottom of the bowl under the tap one or two, as long as the prospective, sometimes 3 feet above the flame can be extinguished

百度翻译，自己对照一下，改改应该没问题