英语词汇“expanding arm”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	expanding arm
释义	expanding arm expanding arm [ik′spand·iŋ ′ärm] (astronomy) A spiral arm of the Galaxy consisting of neutral hydrogen that lies between 2.5 and 4 kiloparsecs beyond the galactic center and is moving out from it at about 85 miles (135 kilometers) per second.
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