“猎户座大星云”的概念、定义、翻译、参考文献-科学参考

单词	猎户座大星云
释义	猎户座大星云 Encyclopedia 理学发射星云释 Orion nebula猎户座大星云位于猎户座的发射星云。用肉眼观察，猎户座中构成“宝剑”的有三颗星，中间一颗是较模糊的亮斑，它不是单颗星，而是一个星云，即猎户座大星云（星表编号为M42和NGC1976）。
随便看	groundwater quality groundwater quality criterion groundwater quality fast detecting meter groundwater quality monitoring groundwater quality monitoring and analysis groundwater quality pollution monitoring groundwater quantity monitoring groundwater radio activity analysis groundwater recharge groundwater regime groundwater remediation groundwater reservoir groundwater resource groundwater resources evaluation groundwater resources of China groundwater resources protection groundwater runoff groundwater seepage flow groundwater seepage velocity groundwater simulation groundwater source field groundwater steady flow groundwater-surface water interaction groundwater system groundwater table

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