例句：
Day by day, and year by year.
一天一天，一年一年。
He is growing year by year.
他一年一年地长大了。
The boy grows taller year by year.
这男孩一年一年地长高了。
He has matured a great deal over the past year.
经过过去这一年，他成熟了许多。
Costs have been reduced by 20% over the past year.
过去一年，各项费用已经减少了20%。
Real wage costs have risen by 10% in the past year.
在过去的一年里，实际工资成本增加了10%。
Together we earn $60,000 per year.
我们每年总共赚$60000。
The population is increasing at about 6% per year.
人口以每年约6%的速度增加。