Using the car's vents might circulate enough air to keep you comfortable on days when the weather isn't particularly hot or when the car's interior hasn't been preheated by sitting in the sun.

利用车内的出风口可能就有足够的空气流通，让你在天气不太热、或是车内没有被太阳晒得很热的情况下感到舒适。

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The farmers are also using large fans to circulate air over orange groves and prevent freezing.

农民们还用大扇子扇风使空气流动，来防止柑橘发生霜冻。

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Run the system for 10 minutes for the dye to mix and circulate and check for leaks using a combination of the UV lamp and goggles and an electronic leak detector.

运行系统10分钟，保证着色剂充分混合进去并开始循环。使用紫外线灯和护目镜，还有电子检漏器检查泄漏。

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It gives examples of how to circulate information to a wider audience by using hashtags and how to direct tweets to legitimate journalists on Twitter.

CNN: STORY HIGHLIGHTS

By looking at pictures and YouTube videos, I can see the regime is using certain tactics: Plainclothes operatives with knives circulate through the crowd and bring out these knives and just as they are feeling safe because they are next to like-minded people who are demonstrating too, the operatives start to attack the protesters.

FORBES: Magazine Article