1、
The comet nucleus itself is too small to hold on to these gases through gravitation.
慧核本身太小,它的引力不足以束缚住这些气体.
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2、
In large objects like Halley's Comet the nucleus is measured in kilometres.
而别的彗星的彗核比如哈雷慧星的彗核要用千米来计算.
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3、
This nucleus has captured the slow-moving neutrons; The star captured a comet.
这核子已经俘获慢运动的中子; 这颗恒星俘获了一颗慧星.
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4、
