Hold the windsock up in the air by its string and run around.

用绳子把风向标举起来，然后跑一圈。

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Since a plant uses it up in the air around, the plant needs moving air to bring more CO2 close to its surface!

由于植物会将周围空气中的二氧化碳耗尽，因此需要空气流动将更多的二氧化碳带到其表面！

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One way to get round this limitation is to set up a laser in mid-air, its beam sampling the molecules along its path as it returns to the source.

避免这个局限的一种方法是在两者之间放置一个激光器，它的光束在返回光源时对途径的分子进行取样。

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Boeing managed to get its 787s up in the air again and resumed deliveries.

FORBES: Boeing Bleeding Cash As 787 Dreamliners Cost $200M But Sell For $116M, But Productivity Is Improving

While its implementation remains up in the air, SUNY aims to introduce Coursera materials this fall and over the next few years as part of its Open SUNY initiative.

ENGADGET

McKesson's contracts with two of its biggest customers are up in the air.

FORBES