第三部分是一个不变量，第一、二部分可以变化无穷。
The third part was an unvarying quantity, but the first and second parts could be varied an infinite number of times.
这种表示是客体平移、旋转和相似变化的不变量。
This representation is invariant to the translation, rotation, and scaling change of the object.
在气候资料中冷暖是随时间尺度而变化的，但也存在不变量。
The climatic colding and warming change with time scale, but there is also invariance.
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