更为复杂的是,深受一种文化推崇的特质不是一定不变的。
Complicating things further, the traits a culture values most are not fixed.
物理学一条基本定律认为动量守恒,也就是说,除非外力进入系统,否则总动量一定保持不变。
A fundamental law of physics holds that momentum is always conserved, meaning that unless some outside force enters a system, its total momentum must stay constant.
海洋的状态总是在变化,其潮汐遵循着一定的节律,但其本质不变。
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