wèi / le / yù / fáng / xìng / chuán / bō / jí / bìng / fā / shēng / xìng / xíng / wéi / shí / yīng / gāi / dài / tào

为了预防性传播疾病，发生性行为时应该戴套。

To prevent sexually transmitted infections, people should use a condom during sex.