Perhaps, then, an open mouth is more a sign of some impending change of state rather than a statement of tiredness itself; awake to asleep or vice versa.

如此说来，也许张嘴打哈欠只是一种即将改变状态的信号，而不是疲倦本身的表现；由醒到睡，反之亦然。

youdao

Perhaps, then, an open mouth is more a sign of some impending change of state rather than a statement of tiredness itself; awake to asleep or vice versa.

如此说来，也许张嘴打哈欠只是一种即将改变状态的信号，而不是疲倦本身的表现；由醒到睡，反之亦然。

youdao