They had been debating the order of important steps in the origin of life.

他们曾就生命起源重要步骤的次序问题进行过争论。

youdao

No one ever precisely pinned down the origin of an order this May to kill all dogs in the town of Heihe, on the Russian border in the far northwest.

没有人能准确查明今年五月份的一项规定的起因，杀掉黑河镇所有的狗，黑河镇位于西北俄罗斯边界。

youdao

Again a DNA fingerprint is made and compared with those on the dung map, in order to pinpoint the origin of the elephant.

然后测定其DNA指纹，并与从粪便提取的DNA指纹比较，以确定大象的来源地。

youdao

The short answer is: calling into question whether the processes of random variation and natural selection are all we really need in order to understand the origin of species.

FORBES: Epigenetics: The Revolution That Wasn't

American said it told the Federal Aviation Administration that it was holding its flights, and the FAA instituted a nationwide "ground stop, " holding all American flights at their origin airports until the order was canceled at most airports at about 5 p.m.

WSJ: Delays Hit 1,300 American Airlines Flights

We do not even know why we are relatively hairless or why we walk on two legs, so finding the origin of religious belief is a tall order.

NEWYORKER: It Ain��t Necessarily So