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大气成分
[气象] atmospheric composition
- 然而天文学家们首次观察就能分析出这颗地球般大小的行星的大气成分。
This is the first time, however, that astronomers have been able to analyze the atmosphere of an Earth-size planet. - 最终，天文学家们也许会发射精度足以确定系外行星大气成分的望远镜，来看看它们是否与地球生命相关的进程相匹配。
Ultimately, astronomers would like to fly telescopes sensitive enough to identify gases in an extrasolar planet's atmosphere to see if they match up with processes associated with life on Earth. - 海卫一直径比月球小22%（海卫一直径约为2700公里，月球为3470公里-译者注），但它是海王星最大的卫星，也是太阳系中为数不多的几颗以氮气为主要大气成分的星球。
With a radius about 22 percent smaller than Earth's moon, Triton is the largest satellite of Neptune and is one of the few bodies in the solar system known to have a nitrogen-dominated atmosphere.
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