Private letters are informal, so we use colloquial language and conversational devices such as short forms.
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His swimming trainer entered him into the competitions, which meant that he had to train at least three times a week.
Translate the sentences intoEnglish.有些人说他们没有从事业余爱好的时间。
尽量延迟张伞的跳伞运动不属于大众业余爱好这一类别。