I quieted down, my heart beating hard.

我听得见自己的心的声音。

It must be real nice and quiet down there.

“那里一定是个真正安静的好地方。

The Zoo quieted down. The visitors had all gone home.

动物园静了下来。游客们全回了家。

But then things started to quiet down, didn't they?

但后来事情开始平静下来了，不是吗？

Now, when things quiet down, go out through the back gate.

待骚动平息之后 你就从后面的小门逃出去。

Fimishka glanced at her husband, who seemed completely reassured, so she too quieted down.

费米什卡看了眼丈夫，似乎彻底放心了，她也安静了下来。

She should quiet down soon. I gave her enough pain meds to choke a... well, her.

她马上就能安静下来了，我给她吃了能把一头...把她放倒的止痛药。

I truly think a calm atmosphere is all you need to really train your mind to quiet down.

我真的认为平静的气氛是你真正训练你的大脑安静下来所需要的。

'Quiet down, ' Biff said to him.

“安静点，”Biff 对他说。

(students chattering) Can everyone please quiet down?

（学生议论声）请大家安静一下好吗？