1.ice sheet 大冰原，冰盾，冰盖

The antarctic ice sheet waxed and waned, and global sea level rose and fell.
随着南极冰盖冰冻和消融，全球海平面也在降低和升高。

But it did not destabilise the ice sheet or provide a new reason to worry about rising sea levels.
但这并没有导致大冰盖发生不稳定现象，也无法为海平面上升的担忧提供新的依据。

2.global warming 全球变暖

Global warming dries out farmland.
全球变暖使农田干枯。

We talk about global warming.
我们谈到了全球变暖。

3.hope for 希望，希望得到

Detailed and public scrutiny and peer group pressure are the most we can hope for.
细致审查、公众监督、以及来自其他集团的压力，是我们所能企盼的最好结果。

You remain passive and convince yourself that you have nothing to hope for.
你消极被动，使自己确信你没有希冀的事。

4.begin to 开始

A younger generation will begin to take over.
年轻一代将会开始接管中国的事务。

You'll begin to recognize the triggers for each of you.
你就能开始认识到每个人的触发点在哪里。