由于马氏体这一淬硬钢主要成分的不稳定性，使得回火成为可能。
Tempering is possible because of the instability of the martensite, the principal constituent of hardened steel.
但目前由于纯鲜牛奶的质量不稳定，其营养成分也就不可靠了。
However, pure fresh milk as a result of the quality of instability, its nutrient composition is not unreliable.
但目前由于纯鲜牛奶的质量不稳定，其营养成分也就不可靠了。
But pure fresh milk as a result of the quality of instability, and its nutrient composition is not unreliable.
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