英语听力：自然百科 鲨鱼湾的海豚—7（在线收听） |
Puck needs to watch out.As she searches in the sea grass,she will be unaware of any shark approaching.If a tiger shark closes form behind,her sonar can not detect it.Distracted,Puck could be easily attacked.Once detected,Puck can easily out swim the shark.But when her calf arrives,it won't so easy for her to escape.it gets very shallow here,this is the low tide too. Dxxgangs,Mother and a calf. Look at this little baby,look at that.More than 10000 G living shark bay.it is the largest population in the world,Grazing on the grass beds,they are the most vulnerable to shark attacks,in the shallows they have less room to manoeuvre.
The calf swims on top of his mum,that way it is protected from the sharks,which could make a good meal of a Dxxx calfm.
Much swim slower than the dolphins,thousands of D calves are taken by the sharks every summer.We got dolphins and D together here,Hey,Puck.Oh,you are wide.
Looking for clues as to when Puck might give birth,J lowers a special microphone into the water. |
| 原文地址：http://www.tingroom.com/lesson/zrbaike/2013/282623.html |