4 sentences

1. 你知道，我们是救生员和渔民。

   nǐ zhī​dào, wǒ​men shì jiù​shēng​yuán hé yú​mín.

   You know, we're lifeguards and fishermen.

   Source: OpenSubtitles

2. 救生员立即对他进行了人工呼吸。

   jiù​shēng​yuán lì​jí duì tā jìn​xíng le rén​gōng​hū​xī.

   The lifeguard immediately performed mouth-to-mouth resuscitation on him.

   Source: Dong Chinese Dictionary

3. 救生员迅速下水去救那个溺水的孩子。

   jiù​shēng​yuán xùn​sù xià​shuǐ qù jiù nà gè nì​shuǐ de hái​zi.

   The lifeguard quickly went into the water to save the drowning child.

   Source: Dong Chinese Dictionary

4. 救生员正在海滩上密切注视着游泳者。

   jiù​shēng​yuán zhèng​zài hǎi​tān shàng mì​qiè zhù​shì zhe yóu​yǒng zhě.

   Lifeguards are keeping a close watch on swimmers at the beach.

   Source: Dong Chinese Dictionary