2 sentences

1. 这就是你的生物钟。

   zhè jiù​shì nǐ de shēng​wù​zhōng.

   This is your biological clock.

   Source: CCMatrix

2. 每个人都有自己的生物钟。

   měi​ge​rén dōu yǒu zì​jǐ de shēng​wù​zhōng.

   Everyone has their own biological clock.

   Source: CCMatrix