This estimated time of origin is decades earlier than the previous estimate of 1930.

此次估计的起源时间比原以为的1930年要早数十年。

youdao

They used this and other HIV-1 genetic sequences to construct a family tree of the origin of the viral strain and to estimate the time of origin of HIV-1 group m.

他们利用这个遗传序列与其他HIV - 1的遗传序列构建出起源病毒株的家系图，并以此估算出HIV - 1 M组的起源时间。

youdao

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。

youdao

It has to have an origin of replication, which we talked about last time, which is compatible with the cells.

所以质粒必须带有复制起点,我们上次讲过,该起点要与受体细胞匹配

耶鲁公开课 - 生物医学工程探索课程节选

This is why he's continually placing the imaginative origin of the poem back to the very dawn of time, perhaps even back before if you can imagine such a time -- before the very dawn of time.

这就是为什么弥尔顿总是试图把想象中的这首诗的起源,推至时间开始的时候，甚至更早,-如果你们能想象这样一个时间--在时间开始之前。

耶鲁公开课 - 弥尔顿课程节选

"Because mutations start occurring at regular intervals in these genes as soon as a new species evolves - like the ticking of a clock - we can use them to trace the evolutionary history of a species back to its time of origin, " said Dr Hedges.

BBC: Earth AP

They looked at 119 genes that have accumulated mutations over the passage of time, allowing the relative times of origin of each species to be estimated.

BBC: Earth AP

In the main, the rules of origin are complex and the paperwork time-consuming.

ECONOMIST: Regional economic integration has a long, long way to go