没有绝对的，不变的道德准则。

There are no absolute, invariable moral rules.

《柯林斯英汉双解大词典》

然而，任何以账面价值入账的会计计量都要面临这么一个问题，会计准则并不是一尘不变的。

However, any measure based on book value has to get over the fact that accounting measures are not carved in stone.

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文中利用一个半位势涡度时间不变式对热带斜压大气地转适应过程中的尺度准则进行了研究。

Based on an invariant of semi-potential vorticity, the scale criterion of geostrophic adaptation in tropical baroclinic atmosphere is discussed.

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