【英语时差8,16】鹰的眼睛（下）

To imitate this lens, you can use a slide projector¹ and what’s called a negative lens — the type used in glasses for people with myopia, or near-sightedness. First, cut a hole the size of the lens in a piece of cardboard. Place the lens in the hole and hold it in front of the projector near the screen. You should see at the center of the screen an enlarged image of one portion of the picture from the slide. Alone, the negative lens won’t enlarge an image, but combined with the lens of the projector, you get the same sort of telephoto system that Galileo used in his telescopes three centuries ago — and the same sort of system that birds have been using for millions of years to spot their prey² from the air.

1 projector   

n.投影机，放映机，幻灯机

参考例句：

• There is a new projector in my office.我的办公室里有一架新的幻灯机。
• How long will it take to set up the projector?把这个放映机安放好需要多长时间？

2 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。