从托福听力背景材料中学单词—火星上的水(14)

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从托福听力背景材料中学单词—火星上的水(14)
本篇文章主要讲的是研究者在火星上发现了水的确凿证据。之前发现的有水的证据
不可靠是因为技术不够先进，现在有了卫星，又有登陆火星的太空舱，可以进一步观测
和检测火星是否有水。下面前程百利小编带大家一块看一下这篇托福听力背景材料中出
现的生词，希望能给正在备考托福听力的同学带来帮助。
Long before the Space Age, humans looking at Mars thought they saw evidence
for the presence of water, in the form of giant (巨大的)canals (运河)built by
some very advanced, very thirsty(饥渴的) civilization. Those 19th-century
notions(观念) proved to be the products of poor telescopes(望远镜) and wishful
thinking(如意算盘): the canals were an optical illusion(错觉). But 20th and 21st
century observers have definitely(清楚的) found water on Mars.
Telescopes spied(侦探) water in ice caps at the Red Planet’s poles, as well
as signs of an ancient ocean covering the northern hemisphere(半球). The Viking
landers saw water frost on rocks, the Phoenix lander found water ice buried
centimeters (厘米)beneath the soil, and the Curiosity rover(漫游者) has rolled
through an ancient riverbed(河床).
Most mysteriously(神秘的), orbiters(人造卫星) overhead(天花板) have
glimpsed the outlines(轮廓) of what seem to be belts of buried glaciers
girdling(围绕) the globe at high latitudes(维度). Some researchers thought the
dust-covered glaciers(冰川) might be mostly made of mud, or of carbon dioxide
ice. But a new study from researchers at the University of Copenhagen
reinforces(加强) the consensus(一致) view that the glaciers are made of water
ice—and a lot of it. The findings are in the journal Geophysical Research
Letters.
The researchers paired a decade’s worth of radar measurements (测量值)with
models of how glacial ice flows on Earth to calculate (计算)the approximate(近
似的) thickness and size of all the Martian glaciers.
Their conclusions? The glaciers contain nearly 150 billion cubic(立方米)
meters of water ice—enough ice to cover Mars a meter deep, and more than enough
to som eday sustain(维持) human colonists. Though of course they’d need to find
a way to melt (熔化)and move all that water around. Who knows—maybe they’d
build canals(运河).
好了，以上就是前程百利小编为大家整理的“从托福听力背景材料中学单词—火星
上的水”这篇托福听力背景材料中的疑难词汇，希望在备考的路上助大家一臂之力。最
后，小编祝大家在托福考试中取得好成绩!