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Inhaling steam two to four times a day may help, too.

呼吸水蒸气两到四次一天也能够有所帮助。

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Anders Wilhelmson says the sanitation process can take as little as a couple of hours or as long as two to four weeks.

VOA: special.2010.03.15

So in addition to having these two carbon bonds, we actually also have four carbon hydrogen bonds in addition to our carbon-carbon bonds.

在这碳碳之间的键以外，我们还有四个碳氢键,除了我们的碳碳键外。

麻省理工公开课 - 化学原理课程节选

Here we go. One, two, three, four, one, two, three, four, nice and loud. Come on. I want to hear it.

来,一二三四,一二三四,大点声,让我能听见

耶鲁公开课 - 聆听音乐课程节选

That happened two to four times in the weeks before his death, he said.

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Expect to pay with warrants and interest rates two to four percentage points above prime.

FORBES: Going Into Hock

According to the DSB, each member owns an average of two to four guns.

BBC: Shootings shock German gun clubs