这句话需要加a吗?Nowadays,millions of migrant workers( a) flock into

这句话需要加a吗?Nowadays,millions of migrant workers( a) flock into 英语翻译Nowadays,millions of migrant workers flock into cities i 英语翻译City ProblemsNowadays,millions of migrant workers flock 这是什么语法?Rise of wages for migrant workers a must 英语翻译Beijing As tens of thousands of migrant workers from a m the role of migrant workers a million of和 millions of 加单复数 BiLdS oF a FeAtheR fLoCk ToGetHeR birds of a feather flock together. 翻译“birds of a feather flock together” “birds of a feather flock toghther",这里的”of a feather”是什么语法,这 A third of the population ___ workers of the car factory.这句话