Don’t buy a tool you are only going to use once.

不要买你只会用一次的物品。

youdao

Their API is slightly strange, but easy to use once you set it up.

它们的 API 有些奇怪，但在设置之后很容易使用。

youdao

It isn't something you buy now and then or pull down from the cupboard, dust off and use once or twice, and then return to the cupboard.

它不是你偶尔买来，从架子上拿下来，抹去灰尘用上一两次然后又放回到架子上的东西。

youdao

Forrester Research says four out of five online adults use social media at least once a month.

VOA: special.2009.09.14

So you cannot use the formula once it hits the ground because once it hits the ground, the fundamental premise that a was a constant of -9.8 or -10 is wrong.

当物体落地以后,该公式就不适用了,因为当物体落地后,公式的基本前提——,加速度为常数-9.8或-10——就不成立了

耶鲁公开课 - 基础物理课程节选

And then secondly, I get, you know, once I get to learn I also get to use that to help people.

其次，一旦我学到了东西，就会用来帮助其他人，

如果成为医生 - SpeakingMax英语口语达人

The question is whether that cost will also limit its use once Dendreon can manufacture all the Provenge it can sell.

FORBES: Dendreon Foe Fails, But...

Meanwhile, the space itself, with its bricks and mortar, beams and open doorways, persists patiently, only ever truly revealed in these in-between moments, when an artist can expose its poetry, before ordinary human use once more renders it banal.

WSJ: London Artists and Curators Ponder the Unconventional With Unique Spaces

An HBO spokesman says it hopes to use AirPlay once it is comfortable with the antipiracy protection.

WSJ: Apple Moves Forward With TV Plans