When the velocity (feed rate) is not constant, several problems can result.
当进给速度不恒定时，会造成许多问题。
The Moon's elliptical orbit means its distance from the Earth is not constant.
月球椭圆型的轨道意味着它到地球的距离是变化着的。
The price of the product is not constant but varies with supply and demand.
产品的价格不是固定的，而是随供求的变化而变化。
所谓自我不是固定不变的。
Parameter of pore water pressure is not constant and changes with time.
孔压系数随时间而变化，并不是常数。
However, international standards are not constant and formats can change.
然而，国际标准不是一成不变的，格式可能发生变化。
The results show that the thicknesses of each zone are not constant and fluctuate obviously.
结果显示：髁突软骨各带厚度不恒定，波动起伏较大。
The results show that the thicknesses of each zone are not constant and fluctuate obviously.
结果显示：髁突软骨各带厚度不恒定，波动起伏较大。
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