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

It lends a class a name that gets it into places, and, in return, that class guarantees certain methods will be available.

它借给类一个将类放置到位的名称，反过来，该类保证特定方法将可用。

youdao

And it is not certain that connecting the world's digital devices will be a viable market soon.

并且现在还不确定连接世界数码设备能否很快的形成市场。

youdao

They know it will come. They know that it will be of a certain level of quality."

VOA: standard.2009.08.31

This spring is getting squashed on either side, and it'll squash by certain amount x, that depends on your mass, and that x will be turned into a motion of a needle and that'll read your mass.

这个弹簧两边都会受到压缩,压缩量为 x,它由你的质量决定,x 会转换成指针的运动,你从而可以读数

耶鲁公开课 - 基础物理课程节选

While it may be true that the archetypal chief executive is driven as much by a desire for power and to amaze the world with his business prowess as by a desire to be rich, human nature makes it certain that some will be guided by meaner motives.

ECONOMIST: Crime and punishment

It will be an array of ideas -- it will contain an array of ideas that address certain areas of the economy and that will have, again, a positive impact.

WHITEHOUSE: Press Briefing

Now that the rating agencies are downgrading CDOs as well as the underlying mortgage-backed bonds that they reference, it seems all but certain that banks and others will be forced into another round of markdowns.

ECONOMIST: If so, who is the Titanic?