1.As for 至于

例句:As for her engagement with Adam, I would say the portents are gloomy.
至于她和亚当的婚约，我看兆头不妙。

2.educated migrants 受教育移民

例句:London is a prime example of a city that draws both immigrants and educated migrants.
在吸引移民和高学历外来务工者方面，伦敦为其他城市作出了榜样。

3.at least 至少

例句:He's been away for at least a week.
他走了总有一个星期吧。

4.on average 平均来说

例句:On average, American firms remain the most productive in the world.
总体来讲，美国公司在全球范围内还是产值最高。