英语听力：自然百科 大堡礁 珊瑚礁至雨林(3)

It finds its prey¹ by detecting the minute electric fields produced by muscles when they contract, including the hard muscles, something no animal can ever switch off.

它通过探测包括心肌在内的肌肉收缩所产生的微电场来寻找猎物，心肌收缩是任何生物都不能停止的。

But they do have to swim directly over a beating heart to know that it's there.

但它们需要游到这颗心脏的上方才能感知位置。

By sucking and blowing, the sting-ray escavates its target deep under the soft sand.

通过吸和吹，这只刺鳐将细沙下的猎物挖了出来。

Many rays feeding together reduces series of florals on the seafloor, but all that puffing² and blowing can attract unwelcome attention.

许多一起觅食的鳐在海床上制造了一连串的沙沟，而吞云吐雾会招来不怀好意的关注。

The hunter can just easily become the hunted.

猎手很容易变成猎物。

This is the sting-ray's worst nightmare,a great hammer-head shark.

这是刺鳐最大的噩梦，一条无沟双髻鲨。

It has electric receptors,too.

它也有电感受器。

They spread across the underside of its very broad head, which sweeps back and forth³, searching for prey.

它们分布在双髻鲨宽脑袋的下底面，脑袋来回摇动寻找猎物。

The sting-ray has a formidable weapon, a venomous barb⁴, but one hammer-head was found with 96 barbs⁵ in its body, and see none the worth.

刺鳐有一种强大的武器毒刺，但是曾在一条双髻鲨身上发现过96根这样的毒刺。

1 prey   

n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨

参考例句：

• Stronger animals prey on weaker ones.弱肉强食。
• The lion was hunting for its prey.狮子在寻找猎物。

2 puffing   

v.使喷出( puff的现在分词 )；喷着汽（或烟）移动；吹嘘；吹捧

参考例句：

• He was puffing hard when he jumped on to the bus. 他跳上公共汽车时喘息不已。 来自《现代汉英综合大词典》
• My father sat puffing contentedly on his pipe. 父亲坐着心满意足地抽着烟斗。 来自《简明英汉词典》

3 forth   

adv.向前；向外，往外

参考例句：

• The wind moved the trees gently back and forth.风吹得树轻轻地来回摇晃。
• He gave forth a series of works in rapid succession.他很快连续发表了一系列的作品。

4 barb   

n.（鱼钩等的）倒钩，倒刺

参考例句：

• The barb of his wit made us wince.他那锋芒毕露的机智使我们退避三舍。
• A fish hook has a barb to prevent the fish from escaping after being hooked.鱼钩上都有一个倒钩以防上了钩的鱼逃走。

5 barbs   

n.（箭头、鱼钩等的）倒钩( barb的名词复数 )；带刺的话；毕露的锋芒；钩状毛

参考例句：

• She slung barbs at me. 她说了些讥刺我的话。 来自《简明英汉词典》
• I would no longer uncomplainingly accept their barbs or allow their unaccountable power to go unchallenged. 我不会再毫无怨言地洗耳恭听他们带刺的话，或让他们的不负责任的权力不受到挑战。 来自辞典例句