记时

nǐ bù hū xī néng zài shuǐ xia dāi duō jiǔ shēn hū xī yī xià wǒ gěi nǐ jì shí

你不呼吸能在水下呆多久？深呼吸一下，我给你记时。

How long can you hold your breath underwater? Take a deep breath and I'll time you.