Perhaps at the beginning you may only afford used stamps.
也许开始你可能只买得起用过的邮票。
Previously, I only know that stamps are used to send mail.
以前，我只知道邮票是用来寄信的。
I'm sorry, foreign stamps can't be used in China.
对不起，外国邮票不能在中国使用。
I used to collect stamps when I was in junior middle school.
我过去在初中时收集过邮票。
I used to collect stamps when I was a boy.
当我还是个小男孩时，我常搜集邮票。
I used to collect stamps when I was a boy.
当我还是个小男孩时，我常搜集邮票。
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