n.兽群,鸟群,群众,棉束,大堆,大量
vi.群集,成群结队而行
vt.用棉束填
A flock of birds was already warbling a cheerful morning chorus.
一群鸟儿已经齐声唱起了欢快的晨曲。
A flock of birds flew towards us slowly from far away.
一群鸟儿从远处朝我们缓缓飞来。
They kept a small flock of sheep.
他们养了一小群羊。