S-3：see the red light 亮起红灯

A:John passed away.

A:约翰去世了。

B:When? I saw him well last month.

B:什么时候?上个月我见他还是好好的。

A:Yesterday. He suffered from a serious disease. When he saw the red light, it was to late.

A:昨天，他得了一种严重的病，当他意识到危险的时候已经太迟了。

B:How terrible!

B:真可怕!