Either so that they wouldn't have to carry everything with them or so they could save time once they arrived at a site by not having to make stuff from scratch.

这样他们要么就不用把所有东西都带在身边了，要么他们到了一个地方的时候不用从头开始做东西，可以节省时间。

youdao

As a linguist once said, "You can get people to think it's nonsense at the same time that you buy into it."

正如一位语言学家曾经说过的那样：“你可以让人们认为这是无稽之谈，但同时你又会相信它。”

youdao

Buy all your clothes at once with a stylist instead of shopping alone, one article of clothing at a time.

和造型师一起一次买完所有你需要的衣服，而不是独自购物、一次只买一件衣服。

youdao

That's why I must decide on something at once while there is still time, before I am famous.

VOA: special.2009.09.20

Never go back. Find another. Leave at once. Go for a long trip again, but this time we'll go wherever I want, won't we?" I nodded. My Lolita.

绝不会去，另找一所学校，马上走，再去长途旅行，不过这次去我想去的地方，好吗？“我点头，我的洛丽塔。

耶鲁公开课 - 1945年后的美国小说课程节选

First of all, it will only be a minute or two at a time, maybe once or twice a lecture.

首先，每次只有一两分钟，一堂课最多不超过两次。

哈佛公开课 - 幸福课课程节选

Texting While Driving Remains Pervasive: More than a quarter of teens (26 percent) read or send a text message at least once every time they drive.

FORBES: Are You A Good Driver? Ask Your Teenager

You can cash them in at any time once six months have elapsed, although there is a three-month earnings penalty if they're redeemed within the first five years.

FORBES: Fact and Comment

One option is to let the euro zone break up, one country at a time or all at once, but the costs of dissolution would be very high.

WSJ: Review & Outlook: Blame It on Berlin