Seeing his happy expression, I know there must be good news.

看他那爽然的神情, 就知道又有好事了.

互联网

This new discovery overthrew the old theory that was completely believed by scientists before.

无论谁求他办事,只要是能办的,他都会爽然答应.

互联网

Hearing that he was fired by the company, he was totally at a loss.

听说自己被公司辞退了, 他爽然不知所措.

互联网