时间:2018-12-24 作者:英语课 分类:Scientific American(二)月


英语课

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.

 



1 precipitates
v.(突如其来地)使发生( precipitate的第三人称单数 );促成;猛然摔下;使沉淀
  • 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
2 subscribed
v.捐助( subscribe的过去式和过去分词 );签署,题词;订阅;同意
  • 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》
3 bugs
adj.疯狂的,发疯的n.窃听器( bug的名词复数 );病菌;虫子;[计算机](制作软件程序所产生的意料不到的)错误
  • 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》
4 catalyze
v.催化
  • They are highly specific for the reactions that they catalyze.它们对被它们催化的反应有很强的专一性。
  • They are highly specific for the reactions that they catalyze.它们对被它们催化的反应有很强的专一性。
5 sleet
n.雨雪;v.下雨雪,下冰雹
  • There was a great deal of sleet last night.昨夜雨夹雪下得真大。
  • When winter comes,we get sleet and frost.冬天来到时我们这儿会有雨夹雪和霜冻。
标签: SSS formation
学英语单词
agricultural emulsifier No.600
annual allowance
ash colour body
atomic resonance line
bathygadus garretti
cerellatron
cessationist
character display unit
character flaw
combining tee T
crune
decemvirates
decrescendoed
dial phones
dicriminalize
dictyostelids
disarthrosis
dome nut
dominant product
door widely open
drilling platforms
duck gizzard spiced
Eschau
family Liparidae
farysia olivacea
five-tire car
fore-slow
frame drum
genus sclerodermas
Google Alerts
grass-earth
Gross-Hehlen
gutter market
heading axis
heater cathode leakage
helicosporium nematosporum
Hiburi-shima
holder in due corse
instrumental roles
invoice outward
Inzegmir
iwconfig
Jack Pudding
keratolysis neonatorum
Lahmu
lay emphasis up on
liquid-gas distributor
liquor pericardii
locking ring mount
logarithmic unit
Lottigna
lubricating compounds
macrophthalmus serenei
Manari
monoeciously
nafi
native-americans
no bit
nonformalizable
nonprecise
oil supply line
open-cell foam
operating earning rate
over-riding
periblems
pit working line
point-focused electron gun
pointing control
prehepaticus
primary local membr-ance
production break
promulging
Put you in mind
restabilization
rub someone's nose in it
russian monetary units
scopulary organelle
secondin'
selection of stars
sketchball
slimline type
small and medium-sized enterprise
specification statement
stator ring
Suiko
sulphuricacid
supplementarity
tabular
tele-robotics
televisings
toplin
toxophilic
transitological
treble agent
trutch
twibit
uncorporated
USDAW
wassenburg
wicked problems
wild oat grasses
wing-handed