Its wings not only beat up and down, but also twist at specific angles.
它的翅膀不但可以上下拍打而且能够在一定角度内翻转。
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Walking down and up the stairs would beat any exercise machine.
上下楼梯课比什么健身器材都有用。
应用推荐
模块上移
模块下移
不移动