当强调人群中每个人接踵而行时,crowd做复数.eg.The crowd were walking to the square.
当强调人流、人群（拥挤）时,crowd作单数 eg.There was a crowd of people in front of the town hall.
当强调人群中每个人接踵而行时,crowd做复数.eg.The crowd were walking to the square.
当强调人流、人群（拥挤）时,crowd作单数 eg.There was a crowd of people in front of the town hall.