a state in which a person is unconscious and cannot be woken, caused by damage to the brain after an accident or illness

He's been in a coma for the past six weeks. 在过去的6个星期里，他一直昏迷不醒。

She went into a deep coma after taking an overdose of sleeping pills. 她服用过量安眠药后，陷入了深度昏迷。