SSS 2009-09-25
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
Every year, millions of monarch 1 butterflies fly thousands of miles to alight in one specific forest in Mexico. How do they know what direction to flutter? Scientists had thought that an insect GPS system in their brains steered 2 them in the right direction.
Now, a new study published in the journal Science overturns that idea. Because sun-related directional sensing actually resides in the butterfly’s antennae 3, say scientists at the University of Massachusetts Medical School.
The researchers remembered a half-century old study that noted 4 that if butterflies lost their antennae mid-flight, they became disoriented. So they put butterflies in a flight simulator and tried to convince them to fly south. Those with their antennae intact had no problem orienting and flying south. But those without their antennae just couldn’t do it. Next they painted some butterflies’ antennae black, blocking light sensing. Those insects couldn’t orient themselves. But when researchers covered antennae in clear paint, the butterflies could once again fly in the correct direction.
Butterfly antennae were already known to sense odor, wind, even sound. Now it seems that they’re also vital for getting lonely Lepidopterans back to Mexico to mingle—and make the next generation of monarchs 5.
- The monarch's role is purely ceremonial.君主纯粹是个礼仪职位。
- I think myself happier now than the greatest monarch upon earth.我觉得这个时候比世界上什么帝王都快乐。
- He steered the boat into the harbour. 他把船开进港。
- The freighter steered out of Santiago Bay that evening. 那天晚上货轮驶出了圣地亚哥湾。 来自《简明英汉词典》
- Sometimes a creature uses a pair of antennae to swim.有时某些动物使用其一对触须来游泳。
- Cuba's government said that Cubans found watching American television on clandestine antennae would face three years in jail.古巴政府说那些用秘密天线收看美国电视的古巴人将面临三年监禁。