adv.神情茫然地;
例句:
The man was making some kind of joke, and he nodded vacantly.
那人在讲着什么笑话, 他茫然地点点头.
Subsequently she looked at Decraye vacantly.
然后她毫无表情地看着德克雷.
He looked vacantly out of the window.
他失神地望着窗外。