SSS 2008-03-21
时间：2018-12-24 作者：英语课 分类：Scientific American(三)月
This is Scientific American's 60-Second Science. I am Karen Hopkin, this will just take a minute.
If you’ve ever given any thought to the life style of the hermaphrodite, it’s probably occurred to you that being both male and female 1 doubles your chances of having a date on the Saturday night. Yeah it’s an old joke, but it's sort of true. Because most hermaphrodites do have to date. In other words, they can't simply fertilise themselves. If they could, I am sure they would. So what actually stops them? I mean what keeps hermaphrodite from mixing together its own sperm 2 and eggs and then staying home to watch TV? In the March 20 online issue of Science, researchers from Japan revealed 3 the answer. They were studying the sea squirt, an animal that reproduces 4 by spewing sperm and eggs into the water and leaving the rest to chance. Combing through the sea squirt genome, the Japanese scientists discovered two sets of genes 5, one produces a protein found on the egg’s surface, the other makes a similar protein on sperm. When these molecular 6 calling cards held from different animals, the proteins come together and allow fertilization to occur. when they are from the same animal, they politely shake hands and go to separate ways. Now if only humans had such a simple system for figuring out who to bring home to mother.
Thanks for the minute, for Scientific American's 60-Second Science, I am Karen Hopkin.
- We only employ female workers.我们只雇用女工。
- The animal in the picture was a female elephant.照片上的动物是头母象。
- Only one sperm fertilises an egg.只有一个精子使卵子受精。
- In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中，一个精子使一个卵子受精。
- They revealed to me that the experiment had failed. 他们向我透露试验失败了。 来自《简明英汉词典》
- His insincerity is revealed by the quick goggle of his eyes. 他眼睛的快速转动泄露了他的不诚。 来自《简明英汉词典》
- The computer reproduces the data as a set of diagrams. 电脑使这些数据再现为一系列图表。
- The original reproduces clearly in a photocopy. 原件复印得十分清晰。