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。Aflock of birds rose in front of him, their wings whirring.一群鸟从他前面飞起来，翅膀发出呼呼的响声。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。A flock of birds passed overhead.一群鸟儿在头上飞过。