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Push factors are associated with the place of origin.
推动因素与原产地有关。
In general, pull factors add up to an apparently better chance for a good life and material well-being than is offered by the place of origin.
一般来说,促使因素叠加显然比原产地提供的条件更易获得良好的生活和物质福利。
If surviving copies are few, the stemma perforce brings into proximity manuscripts that were widely separated in time and place of origin.
如果现存的手稿很少,家谱就必须纳入那些在时间和族地都分散的手稿。
So having a place that the cell knows - where the cell knows how to replicate is important and so plasmids have an origin of replication.
所以得有一个细胞能识别的区域,能使细胞知道,怎样来复制 这很重要,因此质粒上带有一个复制起点
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