英语词汇“first contact, first contact of umbra”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	first contact, first contact of umbra
释义	first contact, first contact of umbra 初亏；主要食相之一；月面和日面外切或月球与地球本影外切的现象。也常指此食相发生的时刻。
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