1.You can catch cold but not discard it . (感冒) 2.You can catch the sun but not discard it . (晒黑) 3.You...
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Discard the things you don't need before you start to work. 基本上就是祈使句的原因 eg.你會聽到 Sit down, please. 這時候也沒有變化阿！ 這是某種縮略的手法，因為口語的方便，省略主詞的用法。