productive life cycle 产品生命周期
The performance of the sows is affected in different stages of the productive cycle.
母猪的生产 性能受繁殖周期各个不同阶段的影响。
Ancient people used it to shorten productive cycle, keep special character of species and expand reproduce coefficient.
古人主要将嫁接技法应用在缩短生产周期，保持物种特异性状和扩大繁殖系数上；
Because it is imposed in multi-links of the productive cycle, the gain can be ensured, and it does not distort the policy making.
因为它是对生产周期多环节征收的税种，因而收入得到保障，并且增值税没有扭曲生产决策。
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