... [ remain a widow live in widowhood ] 妇女死了丈夫以后不再结婚 [ conservation ] (数值)保持恒定不变 [ expect ] 看护 护理 ...
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容器中的压力保持恒定不变。
而它们中的一些保持恒定不变，因变量按某种自然的方式变化，从而维持约束条件。
Some of them are held fixed, and then some dependent variable does whatever it must so that the constraint keeps holding.
这篇报告描述了某一个人为假定的自然界的基本物理常数，似乎并不是一直保持恒定不变。
The report describes how one of the supposed fundamental constants of Nature appears not to be constant after all.
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