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1. astrophysicist n. 天体物理学家
2. gravitational adj. 重力的, 引力作用的
3. observatory n.天文台，气象台，了望台
4. radiation n.放射物，辐射能；辐射
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60秒科学:宇宙的引力透镜揭示了远古星系
时间:2010-11-09 10:53:18 来源:scientificamerican 编辑:sunny 每天三分钟英语轻松学
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