英语听力：自然百科 鲨鱼湾的海豚—9

 many of the mothers have been bitten,bravely trying to protect their calves¹.i am little worried about Puck's calf²,she is really having the calf at peak shark attack time.Most of the calves born by December,this way,the calf has a little bit of time to learn how to breath ,stay with the mum,won't get into trouble.Puck's got a big family,maybe they can look out her.

Puck and her unborn calf are in grave danger.Perhaps sensing her vulnerability,Puck's family gather around her .But there is one number of the Beaches missing.mummy's boy ,India is disappeared.

The next day the rest of the team keep an eye on Puck and look out for the missing India.with still no sign of Puck giving birth,J head north to study the surf mums of Peron.Here is Shark Bay,everybody has different hunting tactics³ and that is particularly true for females,not the males.and females pass them on mother to daughter, J here is here to find out which dolphin is carrying on the surfing tradition.look at that,down on the beach,hunting conditions are perfect.

We just got here this morning at Peron point and it looks like there might be some beaching quite early this morning.

It is high time as huge shoals of mullet are feeding in the shallows.

1 calves   

n.(calf的复数)笨拙的男子，腓；腿肚子( calf的名词复数 )；牛犊；腓；小腿肚v.生小牛( calve的第三人称单数 )；（冰川）崩解；生（小牛等），产（犊）；使（冰川）崩解

参考例句：

• a cow suckling her calves 给小牛吃奶的母牛
• The calves are grazed intensively during their first season. 小牛在生长的第一季里集中喂养。 来自《简明英汉词典》

2 calf   

n.小牛，犊，幼仔，小牛皮

参考例句：

• The cow slinked its calf.那头母牛早产了一头小牛犊。
• The calf blared for its mother.牛犊哞哞地高声叫喊找妈妈。

3 tactics   

n.策略；战术，兵法

参考例句：

• They planned the tactics for the next day's battle.他们制定好第二天的战术。
• He decided to switch tactics.他决定改变策略。