The traffic took a long time to clear after the accident.

事故过去后很长时间交通才恢复畅通。

《牛津词典》

Because the way sound waves operate, we have these low sound waves taking a very long time to clear.

因为声波的运作方式，我们需要很长时间才能清除这些低声波。

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"Our study showed for the first time a clear difference between oxygen and air in the treatment of acute cluster headache.

VOA: standard.2009.12.17

At the same time it's also clear that this epiphany is a remembered experience. It's recalled.

同时很明显这一顿悟,是一种记忆经验，它是被召回的。

耶鲁公开课 - 现代诗歌课程节选

But because the way sound waves operate, we have these low sound waves taking a very long time to clear.

但鉴于声波的传播方式,低声波要过更长的时间才消失

耶鲁公开课 - 聆听音乐课程节选

Have a clear time to go to bed and try to get up at the same time daily (the body craves order).

FORBES: How Doing Nothing Makes You Money.

They want the commission to be required to release a draft designation report well before the public hearing, create a clear time frame for the designation process and require that no more than 10% of any proposed district consist of vacant lots or significantly altered buildings.

WSJ: Mayor of Preservation

For the Gingrich campaign, however, the real problem had become clear some time before this week's results.

ECONOMIST: Newt Gingrich��s campaign