Dunking your head below the surface actually triggers something called your diving reflex.

把你的头浸泡在水面以下其实会触发一种叫做潜水反射的反应。

Due to an ancient diving reflex known as the mammalian diving reflex, we're able to optimize our biology for maximum efficiency during a dive.

由于一种被称为哺乳动物潜水反射的古老潜水反射， 我们能够优化我们的生物学以在潜水期间实现最大效率。

See, it can trigger the diving reflex, where blood vessels constrict and the heart rate slows and blood is diverted to the parts of the body that need it the most, like the brain.

看，它可以触发潜水反射，使血管收缩， 心率减慢，血液被转移到身体最需要的部位，比如大脑。

In fact, hypothermia and the diving reflex is often cited as a big reason why some young children have been able to survive drowning after being under the water far more than 10 minutes.

事实上，体温过低和潜水反射经常被引用为一些幼儿在水下超过10分钟后能够幸免于溺水的重要原因。