【英语时差8,16】会发射紫外线的蜘蛛（下）

Craig and Bernard did laboratory experiments showing that fruit flies are two to three times more likely to fly toward a simple web reflecting ultraviolet¹ light than toward a web not reflecting it. Craig and Bernard also found that many spiders, especially those who forage² near flowering plants, make non-ultraviolet-reflecting webs, then sometimes decorate the webs with special ultraviolet-reflecting silk laid down in flower-like patterns. The bodies of these spiders also reflect ultraviolet light. The two scientists observed webs built by a type of large garden spider in Panama and found that decorated webs with spiders present caught fifty-eight percent more insects per hour than undecorated empty webs.

1 ultraviolet   

adj.紫外线的；n.紫外线

参考例句：

• It's called ultraviolet rays.它被叫做紫外线。
• The sun's ultraviolet rays are responsible for both tanning and burning.阳光中的紫外线是皮肤晒黑和灼伤的根源。

2 forage   

n.(牛马的)饲料，粮草；v.搜寻，翻寻

参考例句：

• They were forced to forage for clothing and fuel.他们不得不去寻找衣服和燃料。
• Now the nutritive value of the forage is reduced.此时牧草的营养价值也下降了。