| 单词 | θ69000 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > nitrogen > [noun] > compounds > deposits or beds (4) nitre bed1788 nitriary1839 An artificial bed of decaying organic matter mixed with lime or other alkaline substances, from which nitre (saltpetre) was formerly obtained. nitrate deposit1853 nitre-heap1867 |
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