The SKIP statement at the end of the file says that white space (blanks, tabs, carriage returns, and line feeds) can occur between tokens and is to be ignored.
文件结尾的skip语句表明，在记号之间可以出现空白(空格、跳格、回车和换行)，空白将被忽略。
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Keep this statement in your file so that you can look back at the end of the term and compare what you expected to gain with what you actually gained.