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1·You must act up to your promise.

你必须实践自己的诺言。

2·You must act up to your promise.

你必须履行自己的诺言。

3·Act up to your belief.

按你的信念办。

4·But you didn't act up to your principle.

但你并没有按你的原则办。

5·What you say means very little unless you act up to it.

你要是说而不做，你的话就没有多大意思了。

6·If you act up to your promise, we are going on cooperating with you.

如果你遵守你的诺言，我们将继续同你合作。

7·The nation's advertisers need to clean up their act.

该国的广告商们需要检点他们的行为。《柯林斯英汉双解大词典》

8·Dominic, the show-off of the group, picked up one measly pear, put it on top of his snout, and performed a balancing act as we made our way back to the cave.

多米尼克，队伍里最爱耍酷的家伙，拿起一个很小的梨子，把梨子顶在鼻子上玩找平衡的杂耍，在我们回山洞的路上捣腾个没完。

9·China's New Food Act provides for a food recall system where producers have to stop production if their food isn't up to standards.

中国的新食品法规定了食品召回制度，如果食物质量不达标，生产商必须停止生产。

10·Moose was ordered to clean up his act.

穆斯被命令“改过自新”。