1 sentence

1. 发生性关系时一定要戴套子，以免意外怀孕。

   fā​shēng xìng guān​xi shí yī​dìng yào dài tào​zi, yǐ​miǎn yì​wài huái​yùn.

   It is important to wear a condom during sex to prevent unintended pregnancy.

   Source: Dong Chinese Dictionary