Except in Antarctic temps, there's rarely a reason to wear a T-shirt, hoodie and blazer all at once, like Tom prefers.

除非在南极，否则没有什么理由像汤姆所喜欢的那样，同时穿一件T恤，连帽衫和休闲西装。

youdao

This has made it very clear that there has to be -if you announce anything you have to announce it all at once on a certain date and you can't have favored people that you give the announcement to.

很明显的一点...,如果要宣布事项,就要选定某一天,而且,你宣布的消息,不能只针对某一人群

耶鲁公开课 - 金融市场课程节选

People can't pay that, if they're in any trouble, they can't come up with the whole value of the loan all at once.

如果人们遇到困难,将无法一次性凑齐这笔大额款项

耶鲁公开课 - 金融市场课程节选

They didn't happen all at once, back then but they happened surely and they don't want to go through that again.

NPR: U.S. Military Faces Strain in Achieving Iraq Plan

"The change we seek won't come all at once, from any act of Congress or any executive order signed by the president, " Bush said.

CNN: Bush rallies support for 'faith-based' services package

Was there not any thought given to try and spread some of this out so that it didn't all hit at once on Capitol Hill?

WHITEHOUSE: Press Briefing