Wind speed changes from time to time, depending on the time of day, weather and location.

风速随时间、天气和地点而变化。

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Pitch controller: to maximize lift as the wind speed changes, a controller can automatically rotate each blade anywhere from a fraction of a degree to multiple degrees per second.

间距控制：为了最大限度地根据风速变化提升发电效率，新型风力发电机上的控制器每秒钟都能够对每一片风叶进行任何角度的调整。

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Scariest of all, what happens if the wind from the east changes?

最为惊人的是，若东方的情况有变又如何？

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Advances in cockpit technology have all but eliminated traditional threats such as jets flying into mountains in bad weather or slamming into the ground because of sudden wind changes on approach.

WSJ: The New Frontier in Air Safety

Also, changes in the speed and pressure of the solar wind cause the termination shock to expand, contract and ripple.

BBC: Voyager impression (Nasa)

None of which, admittedly, is much comfort when the wind changes.

ECONOMIST: Business in America