这是什么语法?Rise of wages for migrant workers a must

这是什么语法?Rise of wages for migrant workers a must they demanded a rise in there wages ( )up for the( )cost of 这句话需要加a吗?Nowadays,millions of migrant workers( a) flock into the role of migrant workers 英语翻译Beijing As tens of thousands of migrant workers from a m 英语翻译Nowadays,millions of migrant workers flock into cities i Rights of migrant workers arouse social concern是什么意思 英语翻译City ProblemsNowadays,millions of migrant workers flock migrant workers怎么读 migrant workers作文 The company has rejected the workers’demands for a rise in p For years the workers have had to tolerate low wages这是个什么样的句