jiàn kāng / jiào yù / kè shàng / lǎo shī / shuō míng / qún jiāo / huì / zēng jiā / xìng chuán bō gǎn rǎn / de / fēng xiǎn

健康教育课上，老师说明群交会增加性传播感染的风险。

In a health education class, the teacher explained that group sex can increase the risk of sexually transmitted infections.