结果表明端粒酶活性水平在胚胎发育过程中表现为阶段性变化。
The results showed that the levels of telomerase activity during the course of fetal development was characteristic of stages.
请简单地谈一下您今天艺术面貌的形成经历了怎样的阶段性变化。
Please talk about your experience changes in stages in terms of forming artistic features.
本文论述北京地区的断层活动特征，着重讨论断层活动的阶段性变化。
The fault activities in Beijing region show a changing feature by stages.
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