“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	triethylamine triethylborane triethylborine triethylene glycol triethylenemelamine triethylenetetramine triethylic borate triethyl phosphate trifid Trifid nebula trifilter hydrophotometer trifluorochlorethylene resin trifluoromethane trifluorotrichloroethane trifoliate trifoliosis triformol trigatron trigeminal nerve trigeminal neuralgia trigger trigger action trigger bolt trigger circuit trigger control

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