“Helix Nebula”的概念、定义、翻译、参考文献-科学参考

单词	Helix Nebula
释义	Helix Nebula [`hē´liks `neb·yǝ·lǝ] ^ASTRONOMY A planetary nebula in Aquarius about 140 parsecs (2.7×10¹⁵ miles or 4.3×10¹⁵ kilometers) distant that has a high helium abundance and the largest known diameter of any planetary nebula.
随便看	truck truck crane truck-mounted drill rig truck-tractor trudellite true true airspeed true-airspeed indicator true-airspeed meter true air temperature true altitude true amplitude true anomaly true azimuth true bearing true-boiling-point analysis true-boiling-point distillation true complement true condensing point true convergence true course true crater true dip true direction true electrolyte

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