rate of bearing variation

例句：

1. 1. The rate of bear variationis a critical factor in determining the successof a breeding program.
   生育率变化率是决定育种计划成功的关键因素。
2. 2. The studyof the rate of bear variation has ledto significant advancements in genetic engineering.
   研究生育率变化率对遗传工程的发展产生了重大影响。
3. 3. The rate of bear variation isinfluenced by various factors, including environmental conditionsand genetic diversity.
   生育率变化率受到多种因素的影响，包括环境条件和遗传多样性。