4周搞定2000+托福核心词
extric = extr(出去) + ic(…的) = 出去的→外来的
exexternally = ex(出) + extern(出去) + al(表状态) + ly(表副词) = 出去的一种状态→在（或从）外部
ity = ity(名词) = 能力
affinity = af(再) + fin(范围) + ity(名词) = 进入范围内→密切关系
尽头
extremity
常考释义
n. 严酷
In the past, the region had been protected by its forbidding geography and the extremities of its climate.
过去，这个地区令人生畏的地理条件和极端的天气状况使它受到保护。
n. 末端；端点；尽头
You can go to the extremities of the aeroplane.
你可以走到飞机的末端。
n. 极度；极端
In spite of the extremity of her seclusion, she was sane.
尽管完全与世隔绝，她依然心智健全。
n. 险境；绝境
Only in extremity, when his defences had been reduced by six weeks of bombing, was he ready to leave.
经过6周的轰炸，他的防御已经不堪一击，在这种极端情况下他才愿意离开。
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