2018考研英語復(fù)習(xí)正在進(jìn)行中，***老師的每日一句每年都倍受關(guān)注，在長(zhǎng)難句解析拆分句子的方法也講解得十分到位，新文道考研匯總了***2018考研英語每日一句，下面是***每日一句第74句。

南極是地球上最不宜居(inhospitable)的地方。然而自從20世紀(jì)早期以來，季節(jié)性融雪(seasonal melting)形成的短期河流和湖泊打破冰雪世界單調(diào)的面貌(break up the monotonous line of ice)，給白茫茫的大地帶來了生機(jī)。這些水體并不像科學(xué)家以前想的那樣少見。上周四發(fā)表的研究報(bào)告顯示，南極邊緣(fringes)存在范圍極廣數(shù)量巨大的融水水系。有些融水河流長(zhǎng)達(dá)75英里，有些水體高于海平面4300英尺，而之前科學(xué)界的共識(shí)是這個(gè)高度是不可能存在液體水的(liquid water had been thought impossible)。科學(xué)家認(rèn)為水系的生長(zhǎng)和擴(kuò)張與過去幾十年溫室氣體的加速排放脫不了干系，而且如果人類一如既往(business as usual)地忽視全球變暖，那么南極冰架表面會(huì)出現(xiàn)越來越多的液體水，大塊浮冰將破碎入海，各大洲的沿海土地都將沉沒。

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.

詞匯突破：

1.Extent 范圍;程度

2.Drainage network 水系

3.Meltwater 融水

4.Ice shelf 冰架

5.Antarctic 南極

6.Chunk 大塊

7.hanging on by a thread 命懸一線

確定主干：

The extent of the drainage network has led some to worry that…

切分成分+獨(dú)立成句：

1.The meltwater may help weaken ice shelves in the Antarctic 賓語從句

2.that are already hanging on by a thread

That= ice shelves (因?yàn)楹竺娴膭?dòng)詞是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

參考譯文：水系的范圍使一些人擔(dān)心融水可能會(huì)削弱南極的冰架，這些冰架本就“命懸一線”，而且融水令大塊大塊的冰破裂并引發(fā)海平面的上升。

明天的句子：

When new symptoms pop up, the temptation to switch medications can be hard to resist, especially because a complex prescription history can condition families to look to drugs first. But sometimes the solution is far simpler.

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