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1.dwarf planet 矮行星
例句：One was a decision to name Pluto are a dwarf Planet.
一个是冥王星被命名为矮行星。
2.by comparison 比较起来
例句：By comparison, expenditure on education increased last year.
相比之下，去年教育经费增加了。
3.Kuiper belt 柯伊伯带
例句：Kuiper belt comet has water that matches ours, study says.
研究表明，柯伊伯带上的彗星拥有与我们相似的水。
4.Hubble Space Telescope 哈勃空间望远镜
例句：The Hubble Space Telescope has taken photos of the Helix Nebula.
哈伯天文望远镜拍下了螺旋星云的照片。
