I can only carry two at a time.

我一次只能带两个。

《牛津词典》

Let's attack one problem at a time.

咱们一次全力处理一个问题。

《牛津词典》

My mind could only assimilate one impossibility at a time.

我的头脑一次只能吸纳一件不可能的事情。

《柯林斯英汉双解大词典》

These come at a time of recession when banks are reporting billions in losses in their credit card divisions.

VOA: special.2009.05.22

And there are very few people that you can sit down and speak to for, like, eight hours at a time.

很少有人你可以坐在一起,一次就能聊天聊8个小时。

普林斯顿公开课 - 人性课程节选

You really can take in everything single at a time, you can really pay attention to each piece.

你真的能够一次专注于一个作品，并理解它。

艺术画廊，来吧 - SpeakingMax英语口语达人

Catching big tuna is about reaffirming your hunter-gatherer instincts, one inch of line at a time.

FORBES: The Young Man And the Sea

For the Liberal Democrats - not many successes at a time of Labour's great weakness.

BBC: After the reshuffle are the knives still out for Blair?

Schedule distraction-free periods on your calendar, during which you can fully attend to one task at a time.

CNN: A New Year's resolution for the workplace