SSS 2011-02-03
时间：2019-01-08 作者：英语课 分类：Scientific American(二)月
Orchids 2 are among the most successful flowering plants, with more than 22,000 species around the world. And that’s not just because of the obsession 3 they inspire in their human fans.
Researchers spent 10 years studying orchids in South Africa, where the flowers are particularly diverse. The scientists say orchids became successful by changing or sharing pollinators, but staying loyal to fungi 4. Here’s one example. There are two species of orchids that live very close together in South Africa. One orchid 1 deposits its pollen 5 on a particular bee’s front legs. The other leaves pollen only on the bee’s abdomen 6. The same bee thus serves two different species and keeps the pollen separate.
But when it comes to fungi—which supply the orchid with nutrients 7—the flowers are much more faithful. They might switch pollinators if transplanted, but they stick with the same fungus 8 species. And one orchid species uses different fungi than a close orchid neighbor, to prevent competing for the same nutrients. The research was published in The American Naturalist 9.
The scientists say the findings help explain how so many species of orchids developed, and can exist so close together. The human mania 10 for orchids, however, remains 11 mysterious.
Thanks for the minute. For Scientific American’s 60-Second Science, I’m Cynthia Graber.
- The orchid is a class of plant which I have never tried to grow.兰花这类植物我从来没种过。
- There are over 35 000 species of orchid distributed throughout the world.有35,000多种兰花分布在世界各地。
- Wild flowers such as orchids and primroses are becoming rare. 兰花和报春花这类野花越来越稀少了。 来自《简明英汉词典》
- She breeds orchids in her greenhouse. 她在温室里培育兰花。 来自《简明英汉词典》
- I was suffering from obsession that my career would be ended.那时的我陷入了我的事业有可能就此终止的困扰当中。
- She would try to forget her obsession with Christopher.她会努力忘记对克里斯托弗的迷恋。
- Students practice to apply the study of genetics to multicellular plants and fungi.学生们练习把基因学应用到多细胞植物和真菌中。
- The lawn was covered with fungi.草地上到处都是蘑菇。
- Hummingbirds have discovered that nectar and pollen are very nutritious.蜂鸟发现花蜜和花粉是很有营养的。
- He developed an allergy to pollen.他对花粉过敏。
- How to know to there is ascarid inside abdomen?怎样知道肚子里面有蛔虫？
- He was anxious about an off-and-on pain the abdomen.他因时隐时现的腹痛而焦虑。
- a lack of essential nutrients 基本营养的缺乏
- Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
- Mushrooms are a type of fungus.蘑菇是一种真菌。
- This fungus can just be detected by the unaided eye.这种真菌只用肉眼就能检查出。
- He was a printer by trade and naturalist by avocation.他从事印刷业，同时是个博物学爱好者。
- The naturalist told us many stories about birds.博物学家给我们讲述了许多有关鸟儿的故事。
- Football mania is sweeping the country.足球热正风靡全国。
- Collecting small items can easily become a mania.收藏零星物品往往容易变成一种癖好。