“expanding arm”的概念、定义、翻译、参考文献-科学参考

单词	expanding arm
释义	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.
随便看	combing combing machine combining glass combining network combining-volumes principle combining weight comb nephoscope combplate combustible gas combustible loss combustible shale combustion combustion chamber combustion-chamber volume combustion deposit combustion efficiency combustion engine combustion engineering combustion furnace combustion instability combustion knock combustion nucleus combustion rate combustion shock combustion train

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