例句:Once the eggs have hatched the shells are left behind.
一旦鸡蛋孵化后，蛋壳就没用了。 

2.ending up 以...结束

例句:I nearly died when I learned where I was ending up.
得知自己到了哪里时，我简直要晕过去了。

3.No longer 不再

例句:She no longer feared that they should misunderstand her.
她不再害怕他们会误解她了。

4.income gaps 收入差距

例句:History also suggests that the income gaps that worry governments will narrow.
历史记录还表明，各国政府担心的城乡收入差距将会缩小。