up跟在动词后面表示“完成/到位”的时候，其实省略也可以，只是意思稍有差别，会少了一层催促你一定要“完成”的感觉。

Eat your food. 吃饭
Eat up your food. 把饭吃完

Drink your milk. 喝牛奶
Drink up your milk. 把牛奶喝光

Clean the room. 打扫房间
Clean up the room. 把房间收拾干净

Pack your things. 收拾东西
Pack up your things. 把东西收拾好

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