Stay well away from the helicopter when its blades start to rotate.

直升机的螺旋桨开始转动时，尽量离远点儿。

《牛津词典》

I want all of you to understand that when I start the machine, it will immediately travel in time and disappear from the present.

我想让你们所有人都明白，当我启动机器时，它会立即穿越时间，从现在消失。

youdao

Transaction processing may seem simple from the outside, but when you start to apply it to various business application scenarios it can get quite complex.

表面看起来事务处理似乎很简单，但是当您开始将其应用于各种业务应用场景时，它就变得相当复杂了。

youdao

Farmers can start rotational grazing by removing animals from a pasture when the grass is eaten to less than five centimeters.

VOA: special.2010.01.19

Right, so the things we want you to take away from this are, get into the habit of using pseudo code when you sit down to start a problem, write out what are the steps.

好，这儿我想大家明白的就是,养成解决问题时先写伪代码的好习惯,把步骤都写出来,我想要告诉你们的是一个好的程序员。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, the only point of interest about this is that when do people start thinking that they're French, as opposed to from a certain family, from a certain village, from a certain region?

所以对这些感兴趣的唯一目的就是,什么时候大家开始觉得自己是法国人了,相对于某个家族,某个村子,某个地区

耶鲁公开课 - 1871年后的法国课程节选

And we could not have done this without extraordinary cooperation first from President Medvedev when it came to the START treaty, and then from my colleagues who were here today when it came to this Nuclear Security Summit.

WHITEHOUSE: Nuclear Security Summit: Presidential Press Conference

But our sole task is decommissioning and to date we have received no information from the IRA as to when decommissioning will start.

BBC: News | NORTHERN IRELAND | First De Chastelain report in full

Of the 20 or so hours that elapse from start to finish when a Camry, Solara or Avalon is built at Toyota's Georgetown factory, half are spent in the paint shop.

FORBES: Just in Time Meets Just Right