瓶颈效应 ( bottleneck effects )是指mtDNA拷贝由母 体向子代传递过程中的一个大幅度削减，这种限制
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There are many defects in the present teaching operational system that severely bottleneck the teaching effects and affect the higher educational quality.
现行的教学运行机制仍然存在诸多不完善之处，严重制约了教学效率，影响了高职教育的质量。
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