巨蟹星云的英文：
crab nebula

crab是什么意思：
n. 螃蟹，爱争吵的人，偏航
v. 捕蟹，偏航，发牢骚
  • Crabs harbor in holes.
    蟹躲藏在洞里。
  • My neighbor is such an old crab.
    我的邻居可真是个爱争吵的人。
  • A crab has two clams.
    螃蟹有两个钳。
  • Crabs scuttle along the muddy bank.
    几只螃蟹沿着泥泞的河堤快速横行。
  • You can not make a crab walk straight
    不要强人所难
nebula是什么意思：
n. 星云,云翳
  • The spiral nebulae are impressive objects.
    旋涡星云是迷人的天体。
  • The element hydrogen comprises 90% of the matter in gaseous nebulae
    元素氢占气体星云物质的90%。
  • The element hydrogen comprises 90% of the matter in gaseous nebulae.
    元素氢占气体星云物质的90%。
  • galactic nebulas are masses of diffuse material within our galaxy
    银河星云是我们星系中的一团团弥散物。
  • Good spectra of the spiral nebulas are difficult to obtain because of their extreme faintness
    旋涡星云因为非常暗，难以得到它们的清晰的光谱。

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