“他们又来了！”一个警察叫了起来。

"There they are again! " exclaimed one policeman.

youdao

这会儿他们又来了。

Here they come again.

youdao

三天以后他们又来了，买了一个更大的(旅行箱)。

Three days later, they came again and bought another big one.

youdao

Before that the United States went through repeated banking crises when people would start demanding the gold for their notes.

才有了中央银行，在这之前,当人们向银行索要金子来兑现他们的纸币时,美国经历了一次又一次的重蹈覆辙的银行业危机。

耶鲁公开课 - 金融市场课程节选