Zài / kàng / shēng / sù / chū / xiàn / yǐ / qián / shāng / hán / zhèng / céng / jīng / shì / yì / zhǒng / hěn / wēi / xiǎn / de / jí / bìng

在抗生素出现以前，伤寒症曾经是一种很危险的疾病。

Before antibiotics appeared, typhoid was once a very dangerous disease.