时间:2019-01-22 作者:英语课 分类:英语时差8,16


英语课

 In general when we refer to a theory we mean something that's not proven yet. In science it's different, as Yael and Don discuss in this Moment of Science.   Y: Today, on "A Moment of Science," we clear up the difference between a scientific theory and a scientific law.


D: Let me guess. You're talking about that argument that if the theory of evolution were true, it would actually be a law.
Y: Yes--I'm tired of hearing people argue that the fact that evolution is a theory means that modern science itself isn't convinced it really happens.
D: Yeah, me too.
Y: And that's why I thought it's worth going over the terminology 1 one more time.
D: Well, the definition of a law is easy. It's a description--usually mathematical--of some aspect of the natural world.
Y: Like gravity.
D: Exactly. The law of gravity describes and quantifies the attraction between two objects. But the law of gravity doesn't explain what gravity is or why it might work in this way. That's because that kind of explanation falls into the realm of theory. And the theory that explains gravity is the theory of general relativity.
Y: Right. According to the National Academy of Sciences, a scientific theory is a "well- substantiated 2 explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses." In other words, all scientific theories are supported by evidence, and you can test them, and--most importantly--you can use them to make predictions.
D: So based on that definition, theories never change into laws, no matter how much evidence out there supports them. Formulating 3 theories, in fact, is the end goal of science.
Y: So to say evolution is just a theory is actually an argument for it and not against it. You can't do any better in science than to be a theory. 

n.术语;专有名词
  • He particularly criticized the terminology in the document.他特别批评了文件中使用的术语。
  • The article uses rather specialized musical terminology.这篇文章用了相当专业的音乐术语。
v.用事实支持(某主张、说法等),证明,证实( substantiate的过去式和过去分词 )
  • The results of the tests substantiated his claims. 这些检验的结果证实了他的说法。
  • The statement has never been substantiated. 这一陈述从未得到证实。 来自《现代汉英综合大词典》
v.构想出( formulate的现在分词 );规划;确切地阐述;用公式表示
  • At present, the Chinese government is formulating nationwide regulations on the control of such chemicals. 目前,中国政府正在制定全国性的易制毒化学品管理条例。 来自汉英非文学 - 白皮书
  • Because of this, the U.S. has taken further steps in formulating the \"Magellan\" programme. 为此,美国又进一步制定了“麦哲伦”计划。 来自百科语句
学英语单词
acetate dye
adiabatic rate
agrested
air ambulance service
ambassis buruensis
anhydrous alumina
Apertura externa aqueductus cochleae
arthorization access
atresia of choana
autofocusses
avisodomy
bandgaps
barrel racer
blend ratio
blues suite
burning off
came into our own
cebus
Chǒngp'yǒng-gun
clastic parent material
clusiodes (microclusiaria) fromosana
cocofibre
complaints department
connate water
continuous-wave laser system
debenture convertible at par
decided case
depreciation-compound interest method
discrete set function
door-knocker
drip-dry
dueling pistol
eleutherotepalous
enielkenie acaroides
equity capital to total debit ratio
escape observation
fastening coefficient
gangue brick
gentlepersons
Granth
grubstaked
hand snip
headle
heavy duty diesel engine oil
humanations
hydracids
hymenopterous parasite
hypervelocity free flow
immediate benefits
international trading
ischialgia
isolation damper
joculators
Laconian
leave your mark
levopromazine
mask detection
megacycles per second (mcps)
megascopes
moisture soil
montagu
mouth ulcers
muschamp
MYLIOBATIDIDAE
narcotics law
ndeq
noise level of electric power plant
normal issue
Nylhair
oligogyny
overdramatically
partiality secured creditor
pasquazzi
Patakour
pedal reserve
petroni
pneumatic oscilating bone drill
primary irritant napkin dermatitis
quack doctor
renal fibrocystic osteosis
revisionisms
roedeans
seeing the point
selective employment tax
selectivity of a receiver
sheet metal press working
Sinopanax
sled stripper
slight impact
spinellan(e)
straight side four point press
this very moment
three balls
tonsilla palatina
trip-out torque
two timer
urban communication system
valve spring cap lock
worst case circuit analysis
yajur-vedas