SSS 2011-04-22
时间：2018-12-24 作者：英语课 分类：Scientific American(四)月
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.
Most plants capture sunlight. And the results are usually green. Because in photosynthesis 1, plant chlorophyll uses wavelengths 2 of blue and our sun's abundant red, and reflects green. But what if—as many sci-fi scenarios 3 suggest—there's an Earth-like planet with multiple suns? Researchers at England's University of Saint Andrews say that photosynthetic 4 life on such a planet might end up as a drab black or gray. Or even with a high SPF.
A quarter of all stars like our sun actually exist in multi-star systems. Plants on a planet with two sunlike stars could need protection against too much radiation—they might evolve their own UV-blocking sunscreens.
Or a planet with two stars may have one sun-like star, along with a red dwarf 5 star that's also common in multi-star systems. Any photosynthetic life would be adapted to take advantage of the available light waves.
Plants that at times relied mostly on the dim red dwarf might need light from all across the visible spectrum 6. They wouldn't reflect any wavelengths, so they'd appear black. These ideas were presented at the current Royal Astronomical 7 Society meeting. So for healthy eating on some other planets, try the leafy dark salad.
"...the setting sun"
Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.
"My love will laugh with me before the morning comes. I see a red door and I want it painted black."
- In apple trees photosynthesis occurs almost exclusively in the leaves.苹果树的光合作用几乎只发生在叶内。
- Chloroplasts are the structures in which photosynthesis happens.叶绿体就是光合作用发生的地方。
- I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
- Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句
- Further, graphite cores may be safer than non-graphite cores under some accident scenarios. 再者，根据一些事故解说，石墨堆芯可比非石墨堆芯更安全一些。 来自英汉非文学 - 环境法 - 环境法
- Again, scenarios should make it clear which modes are acceptable to users in various contexts. 同样，我们可以运用场景剧本来搞清楚在不同情境下哪些模式可被用户接受。 来自About Face 3交互设计精髓
- In some plants photosynthetic products are stored in the form polyfructosans. 在有些植物中，光合作用产物是以多聚果糖的形式储藏。
- Chlorotic or necrotic lesions were evidence of decreased photosynthetic tissues. 缺绿的或坏死的侵蚀斑便是减少了光合组织的证据。
- The dwarf's long arms were not proportional to his height.那侏儒的长臂与他的身高不成比例。
- The dwarf shrugged his shoulders and shook his head. 矮子耸耸肩膀，摇摇头。
- This is a kind of atomic spectrum.这是一种原子光谱。
- We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。
- He was an expert on ancient Chinese astronomical literature.他是研究中国古代天文学文献的专家。
- Houses in the village are selling for astronomical prices.乡村的房价正在飙升。