何凯文每日一句：2018考研英语第74句
2018何凯文每日一句上线，考生们可关注文都考研网，了解每日一句具体内容。每一场考研路都有成败，希望考生们能不忘初心，坚持当初决定考研的信仰。何凯文每日一句会全程陪伴考生，走完2018考研路。对于考研英语的复习，必然是长期积累夯实基础的过程，针对考研英语复习，小编也会及时整理推送相关内容。以下是第74句：【温馨推荐】何凯文每日一句：2018考研英语汇总(KK精讲)
今天的句子：
The extent of the drainage network has led some to worry that the meltwater may help weaken ice shelves in the Antarctic that are already hanging on by a thread, causing large chunks of ice to break off and contribute to rising sea levels.
句子的解析：
词汇突破：
1.Extent 范围；程度
2.Drainage network 水系
3.Meltwater 融水
4.Ice shelf 冰架
5.Antarctic 南极
6.Chunk 大块
7.hanging on by a thread 命悬一线
确定主干：
The extent of the drainage network has led some to worry that…
切分成分+独立成句：
1.The meltwater may help weaken ice shelves in the Antarctic 宾语从句
2.that are already hanging on by a thread
That= ice shelves (因为后面的动词是are)
Ice shelves are already hanging on by a thread
3.causing large chunks of ice to break off and contribute to rising sea levels
= the meltwater cause large chunks of ice to break off and contribute to rising sea levels
参考译文：水系的范围使一些人担心融水可能会削弱南极的冰架，这些冰架本就“命悬一线”，而且融水令大块大块的冰破裂并引发海平面的上升。
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