Clinical trials are done on thousands of people,临床试验在几千人身上进行

thousands of数千的 ...

There are thousands of awnings on the sea beach.

沙滩上有许多遮阳篷。

The liberal candidate romped through with thousands of votes to spare.

自由党候选人轻易获胜，超出选票数以千计。

You might start picking up side effects你可能会出现一些副作用

pick up得到

I am able to pick you up on the short wave radio.

我能用短波收音机收听到你的信号。

The dog easily picked up the scent of the murderer.

狗毫不费力地嗅出了谋杀者的气味。

we all play a part.我们都是试验的一份子

play a part扮演一个角色； 在 ... 中起作用

Hopefully, if he can stay fit he could play a part.

希望,他能很健康,能够成为队中的一部分。