It will never be known how and when this numeration ability developed, but it is certain that numeration was well developed by the time humans had formed even semi-permanent settlements.

我们永远也不会知道这种计算能力是何时、如何发展起来的，但可以肯定的是，在人类形成半永久定居点的时候，这种计数法已经发展得很好了。

youdao

By the time I'm a million, I no longer remember what I was doing when I was a lad of 500,000.

等我活到一百万年，我不记得50万年前我还是个小孩时做过什么。

youdao

The girl was then hit a second time by another van when an elderly trash collector came to her aid, according to some witnesses.

据一些目击者说，当一位上了年纪的垃圾清运员前来帮助她时，这名女孩再次被另一辆面包车撞倒。

youdao

But he says that is not what the United States expects to accomplish by this time next year, when President Barack Obama has said he will begin to withdraw U.S.troops.

VOA: standard.2010.07.22

When the difficult time comes, they will try to survive by themselves.

一旦遇到困境，他们会选择自保。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

I have to believe that whoever came up with that theory for the first time was aided in coming to it by thinking about the end of the Roman Empire, when something precisely like that did happen.

我想任何人第一次接触该理论,都会自动联想到罗马帝国的衰亡,进而支持该理论,因为类似的事情确实曾经发生过

耶鲁公开课 - 古希腊历史简介课程节选

Chris Moore, NASA's deputy director for advanced exploration systems, said the space agency is working on engines aimed at cutting the trip time by the 2030s, when it hopes to send humans to Mars.

CNN: SHARE THIS

It failed to negotiate a seat on the governing council of the Champions League - run by the BCCI, CA and CSA - at a time when it was seduced by the lure of Allen Stanford's ill-fated Twenty20 operation in Antigua.

BBC: Counties hold out hope over Champions League dates

By the time we--at a time when we suffer disproportionately from all of these diseases, such as heart disease, even some forms of cancer now because of our obesity and overweightness, hypertension, Type II diabetes, we really need to be working on ourselves from the inside out.

NPR: Roundtable: Black Women and Body Image