1.take office 上任

Since he took office in 2002, violence has fallen sharply. As confidence returns, the economy is growing at 8% a year.

2002年他上台以后，暴力事件就明显变少了，随着国民信心的回归，经济也以每年8%的速度在增长KJM%p1IYIg。

2.guard against 防范

The Great Wall, you know, was constructed in ancient times to guard against invasion by nomadic tribes from the north.

你知道的，长城是古代为了防范北方的游牧民族入侵修建的zvP_nEHLMd6zhp。

3.be watered down 打折扣；冲淡

Greenpeace said the draft law has been steadily watered down in the protection it would offer.

绿色和平组织表示，草案的保护范围被缩小了w-AY,1oK^OKts9JY。

4.sea change 巨变

There has been a sea change in Chinese leadership on climate change during the past few years.

过去几年里，中国的领导阶层对待气候变化的态度已经发生了翻天覆地的变化-tAi(,#Ab([sdzZ。