SSS 2008-05-02
时间：2019-01-08 作者：英语课 分类：Scientific American(五)月
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This'll just take a minute.
Sharks inspire fear as great predators 1, but their numbers are declining around the world. One way sharks occasionally meet their doom 2 is by getting tangled 3 up in long-line fishing gear. And they can eat the bait set out for the desired fish which makes fishing less efficient and more expensive. But scientists at the National Oceanic and Atmospheric 4 Administration recently noticed something unusual. They reported their findings at a workshop on shark deterrence 5. Some metals react with sea water to create electrical field. And the researchers saw that captive sharks were avoiding areas around one such metal--palladium neodymium. So they thought why not use this finding to help save sharks in the wild and protect the fishing industry? Sharks are sensitive to electrical fields which they use both to find food and to help them navigate 6 through the ocean. It's believed that the electrical fields created by palladium neodymium make sharks back off because they somehow overload 7 the animals' sensory 8 systems. Researchers say the next step is to test whether small ingots of metal in seawater consistently repel 9 animals in the lab. If so, they would then incorporate the metal into shark-repelling fishing lines.
Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.
- birds and their earthbound predators 鸟和地面上捕食它们的动物
- The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
- The report on our economic situation is full of doom and gloom.这份关于我们经济状况的报告充满了令人绝望和沮丧的调子。
- The dictator met his doom after ten years of rule.独裁者统治了十年终于完蛋了。
- Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
- Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
- An extreme school of "disarmers" pronounced stable deterrence was a dangerous deception. “裁军论者”中的极端派声称，稳定的威摄是一种危险的骗局。
- Escalation is thus an aspect of deterrence and of crisis management. 因此逐步升级是威慑和危机处理的一个方面。
- He was the first man to navigate the Atlantic by air.他是第一个飞越大西洋的人。
- Such boats can navigate on the Nile.这种船可以在尼罗河上航行。
- Don't overload the boat or it will sink.别超载，否则船会沉。
- Large meals overload the digestive system.吃得太饱会加重消化系统的负担。
- Human powers of sensory discrimination are limited.人类感官分辨能力有限。
- The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。