Most people don't tan after just one day at the beach, or one session in the tanning bed, because it takes time to make melanin.

大多数人只在沙滩上玩一天或者使用晒黑床一段时间不会被晒成古铜色的皮肤，因为黑色素的合成是需要时间的。

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Each one of the boys was one of the gentlemen who lived in Hawaii at the time, and he was looking for a bride and wrote a letter to a Japanese woman.

每个男生都是当时住在夏威夷岛的绅士之一，而他当时正在寻找新娘，并给一名日本女人写了封信。

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In an experiment, a researcher will place nuts into a can one at a time and then remove them one by one.

在一项实验中，研究人员每次把坚果放入一个罐子，然后再一个接一个地把它们取出来。

youdao

A reputation -- what people think of you, good or bad -- is built one message at a time.

VOA: special.2011.07.22

Once each time. Right? I only do one swap potentially, it-- though not one potentially, each time at the end of the loop I do a swap.

每次循环做一次，对么？我其实,就可能做了一次交换，也许并不是可能，每次循环的结束我都得做一次交换。

麻省理工公开课 - 计算机科学及编程导论课程节选

About one-third of Southern white families at one time or another had at least a toehold in slave ownership.

大约三分之一的南方白人家庭,在某一段时期至少都拥有过奴隶

耶鲁公开课 - 美国内战与重建课程节选

They also talk of building a new plant for a new small car, which would cost a fortune, but ignore their at-one-time hugely profitable rear-drive platform.

FORBES: Magazine Article

"We had the first goal five minutes before half-time, so we were looking at going in at half-time one-nil up, " said Butcher.

BBC: Inverness manager Terry Butcher hopes players learn

If one looks at full-time workers one notices an odd thing.

BBC: The mystery of rising employment