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(单词翻译:双击或拖选)
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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 predators1, but their numbers are declining around the world. One way sharks occasionally meet their doom2 is by getting tangled3 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 Atmospheric4 Administration recently noticed something unusual. They reported their findings at a workshop on shark deterrence5. 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 navigate6 through the ocean. It's believed that the electrical fields created by palladium neodymium make sharks back off because they somehow overload7 the animals' sensory8 systems. Researchers say the next step is to test whether small ingots of metal in seawater consistently repel9 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.
1 predators | |
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面) | |
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2 doom | |
n.厄运,劫数;v.注定,命定 | |
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3 tangled | |
adj. 纠缠的,紊乱的 动词tangle的过去式和过去分词 | |
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4 atmospheric | |
adj.大气的,空气的;大气层的;大气所引起的 | |
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5 deterrence | |
威慑,制止; 制止物,制止因素; 挽留的事物; 核威慑 | |
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6 navigate | |
v.航行,飞行;导航,领航 | |
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7 overload | |
vt.使超载;n.超载 | |
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8 sensory | |
adj.知觉的,感觉的,知觉器官的 | |
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9 repel | |
v.击退,抵制,拒绝,排斥 | |
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