水坑(尤指野生动物饮水的洼地)
水坑(尤指野生动物饮水的洼地)
A depression in which water collects, especially one where wild animals come to drink.
射电天文学上相对安静的电磁波谱区域,位于氢和羟基辐射区之间
A part of the electromagnetic spectrum, between the regions where hydrogen and hydroxyl radiate, that is relatively quiet in terms of radio astronomy.
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