美宇航局选定2020火星探测器着陆点_科学技术

美宇航局选定2020火星探测器着陆点

文章来源：未知文章作者：enread 发布时间：2019-05-31 06:52 字体： [大中小]　进入论坛

(单词翻译:双击或拖选)

NASA has chosen Jezero Crater¹ as the landing site for its Mars 2020 rover mission scheduled to launch in July next year.

美国宇航局已选定耶泽洛陨石坑为2020年火星探测车的降落地点，此次任务计划于明年七月份发射。

According to NASA, the rover will seek signs of ancient habitable conditions and past microbial life, and also collect rock and soil samples to store in a cache on the planet's surface.

On ancient Mars, water carved channels and transported sediments² to form fans and deltas³ within lake basins. "Examination of spectral⁴ data acquired from orbit show that some of these sediments have minerals that indicate chemical alteration⁵ by water," NASA said on its website.

点击

收听单词发音

1 crater
n.火山口，弹坑
参考例句：
With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。 They came to the lip of a dead crater.他们来到了一个死火山口。

2 sediments
沉淀物( sediment的名词复数 )；沉积物
参考例句：
When deposited, 70-80% of the volume of muddy sediments may be water. 泥质沉积物沉积后，体积的70-80％是水。 Oligocene erosion had truncated the sediments draped over the dome. 覆盖于穹丘上的沉积岩为渐新世侵蚀所截削。

3 deltas
希腊字母表中第四个字母( delta的名词复数 )；（河口的）三角洲
参考例句：
Tidal channels, deltas, and washover fans are characteristically associated with offshore bars. 潮汐水道、三角洲和冲刷扇典型地与滨外砂洲伴生在一起。 I know many of the early civilizations prospered on deltas. 我知道很多古老的文明都是在三角洲上蓬勃发展起来的。

4 spectral
adj.幽灵的，鬼魂的
参考例句：
At times he seems rather ordinary.At other times ethereal,perhaps even spectral.有时他好像很正常，有时又难以捉摸，甚至像个幽灵。 She is compelling,spectral fascinating,an unforgettably unique performer.她极具吸引力，清幽如鬼魅，令人着迷，令人难忘，是个独具特色的演员。

5 alteration
n.变更，改变；蚀变
参考例句：
The shirt needs alteration.这件衬衣需要改一改。 He easily perceived there was an alteration in my countenance.他立刻看出我的脸色和往常有些不同。

上一篇：中国公布600km/h磁悬浮列车原型下一篇：中美科学家将石墨烯变成半导体