The crowd做主语是单数还是复数要看具体语境。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作单数。
The crowd dispersed quickly.
人群很快便散开了。
The crowd reacted violently.
人群反应强烈。
They walked among the crowds in Red Square.
他们走在红场上的人群之中。
Extra police are being drafted in to control the crowds.
现正在另外抽调警察去控制人群。
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