这件事由他们负责。

This matter is their concern.

《牛津词典》

我发现让敏捷团队负责人当主持人是很有帮助的，因为在下次迭代中主要由他们负责帮助团队进行改进。

I find that it is often helpful for the Agile team lead to be the lead facilitator because they will be primarily responsible for helping the team implement the improvements in the next iteration.

youdao

他们从未声称制造了所有的怪圈——许多是由他人跟风模仿的，但他们的恶作剧应对引起麦田怪圈现象负责。

They never claimed to have made all the circles — many were copycat pranks done by others — but their hoax was responsible for launching the crop circle phenomena.

youdao

It's headed by one person but in our case it had 4-5 people working on nothing but the president's schedule.

通常有一个人完成,但我们的办公室由4，5个人负责,他们仅仅是负责日程安排。

普林斯顿公开课 - 国际座谈会课程节选

That's again up to the board to decide or they can set up a committee on the board that would decide, but ultimately, that's a major decision to send out dividends.

这也是由董事会决定的,他们可以建立一个委员会来负责此事,但最终,发放股利是个重大的决定

耶鲁公开课 - 金融市场课程节选