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1·I tried to give her something to drink but she couldn't keep it down.

我试图让她喝点儿什么，但她咽不下去。《柯林斯英汉双解大词典》

2·Keep it down. My kids are sleeping.

小声点，我的孩子们在睡觉。

3·Could you keep it down, please?

你可以把它关了吗？

4·Hey, could you keep it down?

喂，你可以轻一点吗？

5·Now, will everybody keep it down…

现在，大家都就地卧倒…

6·Can you keep it down?

你能不能保持安静。

7·Can you keep it down?

你能不能保持安静？

8·Excuse me, miss, could you keep it down?

对不起，小姐 你能不能小声一点？

9·I promise I'll keep it down in the future.

我保证今后一定把音量放低。

10·Keep it down Sir Or they'll all be wanting one.

别让别人看见，先生，要不别人都要。