1.no longer 不再

例句:After about three months, I was no longer addicted to nicotine.
大约3个月后，我就不再对尼古丁上瘾了。

2.get worse 变得糟糕

例句:In fact, things could get worse in the short run.
事实上，事情在短期内可能会变得更加糟糕。

3.instead of 取代；代替

例句:Water companies should concentrate on reducing waste instead of building new reservoirs
自来水公司应该集中精力减少水浪费，而不是修建新水库。

4.keep pace with 跟上

例句:Our understanding often fails to keep pace with the march of events.
我们的认识常常赶不上形势的发展。