只需要多几次这类切除，就能达到带有单一环状线粒体祖先全部功能性基因的18条微型染色体。

It would take just a few more excision events to arrive at 18 mini chromosomes with all the functionality of their single-circle ancestor.

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目的：评价国产多西环素治疗呼吸系统感染的有效性和安全性。

AIM: to evaluate the safety and efficacy of domestic doxycycline in the treatment of respiratory tract infections.

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总体设计是矿用汽车设计过程中的重要一环，该设计过程涉及的参数多、知识复杂，包括大量模糊性和非数值性计算。

With not only many parameters calculated, but also much knowledge used in the processes, the concept-design is very important in the design of mining truck.

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