Cricket keeps an off-field umpire for boundary calls, and to ascertain whether batsmen are run out and if catches are real.

板球有一个场外的裁判来判定边界，并确定击球手是否出局，接球是否真实。

youdao

It can be difficult to ascertain the facts.

可能难以查明事实真相。

《牛津词典》

The police are trying to ascertain what really happened.

警方正设法查清到底发生了什么。

《牛津词典》

Thus,he says,it is not possible to ascertain who is responsible for the shelling or to make a definitive casualty count.

VOA: standard.2009.05.11

It's seeking to ascertain the meaning of events to draw larger philosophical, ideological conclusions from the events of history, and to point to the larger purpose or design of history, not to say just what happened, but to say why it happened and what it means for us today that it did happen.

它致力于查明事件的意义,得出哲学性的思想性的结论，从历史事件中，并且指出历史图景中的宏观目的，不说发生了什么，而阐明为什么它会发生,而它发生了对于今天的我们有何意义。

耶鲁公开课 - 旧约导论课程节选

German Chancellor Angela Merkel, speaking in Parliament in Berlin, is calling for patience to ascertain precisely what happened while defending her country's military mission in Afghanistan.

VOA: standard.2009.09.08

It became the job of Alec Station to ascertain what they were up to.

WSJ: Manhunt on HBO; The Big C; Hereafter on Showtime: Television Reviews by Nancy deWolf Smith

One conundrum associated with badges in the past was how to ascertain consistent validity and security.

FORBES: Badges Lend Gravitas To Free Education Revolution

It could also have been used to ascertain if one BCS conference should be dropped.

FORBES: Big East Adds Some Texas Beef To Its Plate