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，推荐阅读新收录的资料获取更多信息
When the star eventually releases its outer layers, it shrivels down to its core in what's known as a white dwarf star. At that point, it'll be about the size of Earth.。关于这个话题，新收录的资料提供了深入分析
structural -- it acts on "any record with at least these fields." Simple-sub