SSS 2008-02-29
时间：2018-12-24 作者：英语课 分类：Scientific American(二)月
This is Scientific American's 60-Second Science. I'm Karen Hopkin, this'll just take a minute.
Next time you are shoveling snow off your walk, don't blame the weatherman, blame bacteria. Because an international team of scientists has found that microbes that float through the atmosphere can seed the formation of ice crystals in clouds, crystals that then precipitates 1 snow. The discovery subscribed 2 in the February 29 issue of Science. Some bacteria including bugs 3 that infected plants have been known to catalyze 4 the growth of ice here on earth. So the scientists got to wondering whether they might do the same in the sky. Making atmospheric ice crystal is the first step in any recipe for precipitation whether the final dish is rain or sleet 5 or snow. So the scientists collected fresh snow from various places around the world including the French Alps and Antarctica and Bozeman, Montana. They found that most of their samples contained cells and cell fragments and these biological materials were capable of nucleating the growth of ice. How the bugs got there in the first place is anybody's guess. The scientists figure microbes may drift thousands of miles before they get caught up in a cloud and scare up a storm. Just something to ponder next time you stick out your tongue to catch a pretty snowflake.
Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.
- Water precipitates camphor from its alcoholic solution. 水能把樟脑从其酒精溶液中淀析出来。 来自《简明英汉词典》
- Precipitates are usually collected by centrifugation at intervals. 常常是用离心法分段收集沉淀的。 来自辞典例句
- It is not a theory that is commonly subscribed to. 一般人并不赞成这个理论。 来自《简明英汉词典》
- I subscribed my name to the document. 我在文件上签了字。 来自《简明英汉词典》
- All programs have bugs and need endless refinement. 所有的程序都有漏洞，都需要不断改进。 来自《简明英汉词典》
- The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》