The sounds bounce off them and the lower jaw captures the returning sounds, making it possible for the dolphin to sense what's in the surrounding water and decide where to swim.
声音从它们那里折射，下颌捕捉到返回的声音，使海豚能够感受到周围水域中有什么，并决定游向哪里。
2
The mantle's motions, analogous to those in a pot of boiling water, cool the mantle by carrying hot material to the surface and returning cooler material to the depths.
地幔的运动类似于一壶沸水的运动，它把热的物质带到表面，再把较冷的物质带到深处，从而使地幔冷却。
3
The hot water from the street runs through them, warming the groundwater, before returning to the surface via another pipe.