A ladybug in flight beats its wings up to 85 times per second.
瓢虫飞行时每秒钟扇动翅膀85次。
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The bird fluttered its wings up and down.
那只鸟上下地拍动翅膀。
Most birds flap their wings up and down, but hummingbirds move their wings in a figure-eight pattern.
大多数的鸟是上下拍打翅膀飞行，但蜂鸟不一样，它是以八字形移动翅膀。
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模块上移
模块下移
不移动