He had lapsed into unconsciousness.

他陷入了昏迷状态。

He knew that he might soon lapse into unconsciousness.

他知道他可能很快就会陷入昏迷状态。

The injured man tried to speak but soon drifted into unconsciousness.

受伤的男人想说点什么，但一会儿就不省人事了。

Giddiness and possible unconsciousness.

眼花并可能失去知觉。

He did not know how long his unconsciousness lasted.

他不知道他那不省人事的状态持续了多久。