According to probability principle of multiplication, the survival rate was the product of retention rate at certain period and survival rate at the previous period.

根据乘法概率法则，将某一年龄段的留存率与前一年龄段的生存率相乘可得该年龄段的生存率。

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There is a high prevalence rate of early childhood caries(ECC), and it results from a multiplication of risk factors, including different hosts, microorganisms and inappropriate behaviors.

儿童早期龋（ECC）的患病率一直居高不下，其发生是宿主因素、生物学因素和行为因素等多因素作用的结果。

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Methods The growth rate and recovery of C6/36 cell was evaluated. MTT, inverted microscope observation was using in this study to observe the effects of piperine on cell multiplication.

方法采用冲击测试法测定胡椒碱对白纹伊蚊C6/36细胞株生长率及核分裂的影响，相差显微镜对细胞进行形态学观察，并观察受损细胞的恢复；

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