词汇:
infrared adj.红外线
dwarf n. 矮星
NASA 是缩写词,全称是National Aeronautics and Space
the wildest objects :任何你能想象得到的天体。wild 有未被人驯养的荒唐的离奇的意思。
polar orbit:极地轨道。指轨道平面与赤道面夹角为90。的人造地球卫星轨道。人造卫星运行时能到达南北极区上空,即卫星能飞经全球范围的上空。需要在全球范围内进行观测和应用的气象卫星、导航卫星、地球资源卫星等都采用这种轨道。
infrared radiation:红外线辐射
Brown dwarfs:褐矮星。褐矮星非常暗淡,很难发现它们,要确定它们的大小就更加困难。
练习:
A It is small in size but carries a large camera.
C Its digital camera can help astronomers to see the unknown space.
Which is NOT the synonym for the word snap in the third paragraph?
B shoot.
D photograph.
A is no different from an ordinary camera.
C catches the infrared radiation while the ordinary camera does not.
Which of the following is NOT correct aboutasteroids according to paragraph 7?
B Asteroids do not reflect light that reaches them.
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