松鼠这个攀登健将，突然有一天在飞行班级中遭受了一次挫折，他的老师要求他从地面向上而不是平时那种从树稍向下自由自在的跳跃。

The squirrel was excellent in climbing until he developed frustration in the flying class where his teacher made him start from the ground up instead of from the treetop down.

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它们伸展四肢，就像飞行中的松鼠一样。

They stretch out their legs like flying squirrel.

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