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(zhǎng)大了。
The boy grows taller year by year.
這男孩一年一年地長(zhǎng)高了。
He has matured a great deal over the past year.
經(jīng)過(guò)過(guò)去這一年，他成熟了許多。
Costs have been reduced by 20% over the past year.
過(guò)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(guò)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。