[译] 如果冠脉血栓形成，患者马上就有生命危险。
[误] If coronary thrombosis occurs, the victim's life is immediately dangerous.

[正] If coronary thrombosis occurs, the victim's life is in immediate danger.
[注] dangerous(=not safe)意为"危险的",如: Shooting off fire-crackers may be dangerous.燃放爆竹可能有危险。be in danger意为"处于危险中",如: Helen was in danger of losing her life.海伦有生命危险。