劳动力的人口构成也发生了变化。 

2.stand out 突出

例句:He played the violin, and he stood out from all the other musicians.

他演奏了小提琴，把其他所有乐师都比了下去。 

3.income taxes 收入所得税

例句:They have brought down income taxes.

他们降低了收入所得税。 

4.less than 少于；低于

例句:The marriage had lasted for less than two years.

这段婚姻维持了不到两年。