例句：

　　Day by day, and year by year.

　　一天一天，一年一年。

　　He is growing year by year.

　　他一年一年地長大了。

　　The boy grows taller year by year.

　　這男孩一年一年地長高了。

　　He has matured a great deal over the past year.

　　經(jīng)過過去這一年，他成熟了許多。

　　Costs have been reduced by 20% over the past year.

　　過去一年，各項(xiàng)費(fèi)用已經(jīng)減少了20%。

　　Real wage costs have risen by 10% in the past year.

　　在過去的一年里，實(shí)際工資成本增加了10%。

　　Together we earn $60,000 per year.

　　我們每年總共賺$60000。

　　The population is increasing at about 6% per year.

　　人口以每年約6%的速度增加。