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.
与上月相比，70个受访城市的二手住宅价格环比全部下降，最小降幅为0.5%，最大降幅为2.0%。
Prices for existing homes fell in all 70 cities, with drops of between 0.5% and 2.0%.
弧形止推环吸收内部压力施加的全部推力。
Segmental thrust ring absorbs all the thrust applied by internal pressure.
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