他说：“如果有九只兔子，集中精力抓一只，不要试图把它们全部抓住。”

"If there are nine rabbits, focus on catching one, don't try to catch them all," he said.

youdao

他如果九点出发，现在应该到这里了。

If he started out at nine, he ought to be here by now.

《牛津词典》

如果它拖延，一场更愤怒的抗议浪潮很可能会在九月爆发。

If it stalls, a wave of even angrier protests may well erupt in September.

youdao

You can tell if you're at all experienced with it very easily, if you go--let's say to the year 900 B.C.

而如果你对此比较熟悉的话很容易看出来,如果你去--假定去公元前九百年

耶鲁公开课 - 古希腊历史简介课程节选

It does represent the sum, in the sense that if i gave you four bucks and I gave you five bucks, I gave you effectively nine.

它表示的就是这两个矢量的和,好比是如果我给了你四美元,然后再给你五美元,我其实给了你九美元

耶鲁公开课 - 基础物理课程节选