постоянство
来自维基词典，自由的词典
恒定
不变 守恒 常数 〔中〕坚定不移，始终不渝；永恒性，恒定；常性
- ～ в дру́жбе友谊的永恒性
- зако́н ～а вещества́物质守恒律.
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