1.Over time 随着时间推移

例句:Over time, the technology is diffused and adopted by other countries.

久而久之，这项技术传播到了其他国家并得到利用。

2.work out 解决；算出

例句:It is proving hard to work out the value of bankrupt firms 'assets.

清算破产公司的资产值其实很困难。

3.by contrast 相比之下

例句:The private sector, by contrast, has plenty of money to spend.

相比之下，私营部门就有很多钱可供开销。

4.over the course of time 随着时间推移

例句:Over the course of time, currency fluctuations tend to wash out.

随着时间的推移，汇率波动会逐渐趋于衰竭。