The adult cicada has two sets of wings which can shake together to produce a high, continuous sound when the weather is hot.

成年蝉有两对翅膀，当天气炎热时，这两双翅膀一起震动，发出一种巨大而连续的响声。

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On the one hand, the sound of liberty, the careless happiness of the leisure which has wings; on the other, the sound of toil.

一方面是自由、自得其乐和长了翅膀的悠闲的声音，另一方面是劳动的声音。

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The sound of an eagle's wings beating as it takes off majestically from the top of a mountain? "That sound will invariably be made by an umbrella opening and closing," Palmer says.

“老鹰在山顶扑哧着翅膀准备飞起来的声音其实是通过雨伞的一开一合发出的，”帕尔默说道。

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Layers of sound fold one over another, the low beat of a dragonfly's wings joined by the calling of crickets, the clucking of a mother hen with her chicks, and the thrum of a motorcycle passing in the distance.

BBC: High spirits in Bali