"突然失明"可以用英文表达为 "suddenly lose one's sight" 或 "suddenly become bpnd". 这个说法的来源是指突然出现的失明症状，可能是由于眼睛受伤、眼睛疾病、脑部损伤或其他原因造成的。

一些英文例句和中文翻译如下：

She suddenly lost her sight in a car accident. (她在一场车祸中突然失明。)
He suddenly became bpnd due to a stroke. (他因中风突然失明。)
The man was walking down the street when he suddenly lost his sight. (这个人在走街时突然失明。)
After the explosion, several people suddenly lost their sight. (爆炸后，几个人突然失明。)