4 sentences

1. 他喜欢在夏天去海里潜水。

   tā xǐ​huan zài xià​tiān qù hǎi lǐ qián​shuǐ.

   He likes to go diving in the sea during the summer.

   Source: Dong Chinese Dictionary

2. 我带来了我的旧潜水装备。

   wǒ dài​lái le wǒ de jiù qián​shuǐ zhuāng​bèi.

   I brought my old scuba gear.

   Source: OpenSubtitles

3. 这副潜水眼罩的密封性非常好。

   zhè fù qián​shuǐ yǎn​zhào de mì​fēng​xìng fēi​cháng hǎo.

   The seal on these diving goggles is excellent.

   Source: Dong Chinese Dictionary

4. 他在群里潜水很久了，从来不发言。

   tā zài qún lǐ qián​shuǐ hěn jiǔ le, cóng​lái bù fā​yán.

   He has been lurking in the group for a long time and never posts anything.

   Source: Dong Chinese Dictionary