crowd即可做单数也可做复数

当强调人群中每个人接踵而行时,crowd做复数

当强调人流、人群（拥挤）时,crowd做单数

It took me a long time to thread my way through the crowd.

我花了很长时间才从人群中挤过去。

Try and push your way through the crowd.

试着从人群中挤过去。

They had the advantage of playing before their home crowd.

他们有在主场观众面前比赛的优势。

I had to fight my way through the milling crowd.

我不得不在涌动的人潮中挤出一条路来。