Diving into unsafe water can lead to serious injuries.
潜入不安全的水域会导致严重的伤害。
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But while you can learn a lot on your own diving into an unknown area, your education can be greatly accelerated when you have an experienced person to check in with or to lead you.
But in a lake where accidentally swallowing the water while diving could lead to near-instant asphyxiation, no one was in a hurry to find out what it might be.