I'll be on call the night of the party.

在聚会的晚上我将随时听凭召唤。

《牛津词典》

Aren't you scheduled to be on call?

你不是排好时间表随时待命的吗？

youdao

Moreover, they stipulated that Yao Ming should be on call for the national team.

此外，他们还规定姚明应当随时等待国家队的召唤。

youdao

For the next 12 hours, the medevac teams and machines will be on call to evacuate wounded troops from anywhere in eastern Afghanistan to Bagram's military-run trauma hospital.

VOA: standard.2010.04.27

The voters, or candidates, whatever you want to call them, depending on where they stand, in this game they're going to be you.

选民或候选人,随便你们想怎么叫,基于他们的选择,在这个博弈中他们是你们

耶鲁公开课 - 博弈论课程节选

But we'll be focusing on what we call "The Nativity Ode."

但我们会重点讲解,《降生颂歌》

耶鲁公开课 - 弥尔顿课程节选

That way some part of the team can be available around the clock without requiring everyone to be on call.

FORBES: Sleeping With Your Smartphone? Here's the Cure

Expect to be on call for any crisis that ?arises, even if it conflicts with a long-planned, once-in-a-lifetime Mekong River cruise.

FORBES: For Retirees On Corporate Boards, The Rewards Go Beyond Cash

"There's this pressure to be on call outside of the office, either at your house or while you're on vacation, " she says.

FORBES: Accounting For Human Error