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

"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