第26次打卡（12月8日）

1）We'd been talking  about how sea animals find their  way under water, how they navigate and this interesting puzzle and one......I assure......enjoy......I mean, everybody loves......And dolphans,they actually two types of sounds,one being ......you probably often ......million ways which......

2)But one concern today is rapid ......location ,so they ......what's around them.They sounds......are produced in the air field ......of dolphans......how do......sounds get transmitted into water.It's not easy ......The......media......the faster sound travels,so sound travels faster through water than it does through air.

3)You got some way travelling early through media when suddendly .It has different media.What can happen then ?Some of these energies can be relected back.Some of the energies can be transmitted into the second media.And if the two media have really different densities like air and water.Then most energies can be relected back very little can keeping going.It gets transmitted a new media.

4)So how did dolphans ......gets transmitted from air......into the ocean water.Because given the difference of density between the air......and sea water.We ecpect those the sounds just......around ......dolphans head which were no good at all.

5)It turns out that the jaw is primarily responsible for......and transforming......sound way to the dolphans in the ear.So the rapid ......stand out ......objects.Maybe a group of fishes swimming here and ......over there.The sounds ......often ......making it possible  for dolphans to sense what's in the surrounding water and decide to where to swim.