刚开始学习scheme 用DrRacket写代码，但是有一些代码当时理解，但是过后怕忘记，请问在DrRacket怎么写注释

好吧，是用;来注释了，

1.3.9 Reading Comments
;
starts a line comment. When the reader encounters ;, it skips past all characters until the next linefeed (ASCII 10), carriage return (ASCII 13), next-line (Unicode 133), line-separator (Unicode 8232), or paragraph-separator (Unicode 8233) character.
#|
starts a nestable block comment. When the reader encounters #|, it skips past all characters until a closing |
#. Pairs of matching #
| and|# can be nested.
#;
starts an S-expression comment. When the reader encounters #;, it recursively reads one datum, and then discards it (continuing on to the next datum for the read result).
#!
(which is
#! followed by a space) or #
!/ starts a line comment that can be continued to the next line by ending a line with \. This form of comment normally appears at the beginning of a Unix script file.
Examples:
; comment reads equal to nothing

#| a |#
1 reads equal to 1
#|
#| a |#
1 |# 2 reads equal to 2
#;1 2 reads equal to 2
#!/bin/sh reads equal to nothing
#! /bin/sh reads equal to nothing

常用的就是
;这是一行注释
#|
这
是
一
整
段
注
释
|#