beat the air

基本解釋

His speech merely beat the air as his argument was not convincing at all.
他的縯說一點用也沒有，因爲(wèi)他的觀點不令人信服。
And the gander opened his strong wings and beat the air with them to show his power.
說完，它張開自己的大翅膀拍打著周圍的空氣，以此來表示自己有多麼強大。
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large calm lakes there too, in which white swans were swimming, and beat the air with their wings.
木中還有靜靜的湖，湖裡還有遊泳著的白天鵞，它們在拍著翅膀。

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Its four carbon fiber and foil wings beat up to 20 times per-second, propelling it through the air as if it were swimming rather than flying.
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