Radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops.

用于跟踪风暴的雷达只能在大气中凝结成云或雨滴后才能够探测到水。

youdao

Once the session was over, this person was asked to identify which of the four images had been used.

会议一结束，这个人就被要求辨认四张图片中哪一张被使用过。

youdao

Believe it or not, yellow was once used to mean stop.

信不信由你，黄色曾经用于表示停止。

youdao

Once growth is established, the box can be removed and used to start another planting.

VOA: special.2010.07.13

Once we sort of settle into this vocabulary, and once we get used to this clearly unquestioningly scientific perspective, why on earth do we need pseudo-statement or fiction at all?

一旦我们习惯了这种用语，一旦我们习惯了,这种科学视角，我们为什么还需要伪陈述和虚构呢？

耶鲁公开课 - 文学理论导论课程节选

The meetings used to be held about once every two years.

VOA: special.2009.06.03

Ms. Lanza "seemed to really enjoy gardening and landscaping, " said Newtown resident Rhonda Cullens, who said she and Ms. Lanza were part of a group of neighborhood women who used to gather once a month to play bunco, a parlor game with dice.

WSJ: Portraits of Newtown Victims

Such technological disruptions from the steam engine and electricity to the internal combustion engine and the transistor used to come once a generation or so.

ECONOMIST: OPINION

The types of disruptions that used to occur once in an era or generation in the past are now happening in a matter of years or months.

FORBES: Tarun Wadhwa - Disruption and Democracy - Archive