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
a-twin
abashedness
abelove
Acrocomia
actual net heat drop
animadversive
antiseptioismus
apu exhaust
arribada
articulatio spheroideas
auxiliary intersection point
by wag of parenthesis
celery (fruits) oil
cigar box wood
circular thin-layer chromatography
claim equity
collodio-bromide
common battery telephone exchange
computation speedup
cosmopolitan plant
crinkle-crankle
crna reka
data-oriented
diastimeter
diffusion battery
digitoxigenin-6-deoxyglucoside
domestic animal insurance
drag spring thimble
electrical power system
electronically steerable array radar (esar)
epidermic medication
exorbitance, exorbitancy
faff
falling of vagina
false dragonhead
FCD
feeding trough
flanged bush
fluid cast
fritillaria
frozen fish
fructus zizyphi sativae
gadinometer
glaciohydrology
hepatic comas
high annealing
historical ethnology
in full course
JLPT
John W.Flannagan Res.
Jones nois-equivalent power
Kienan's spaces
kits
kittens
l-rhodeose
L/G (letter of guarantee)
Lautaret, Col du
louver sieve
Malus honanensis
Maria Meneghini Callas
Meliti
mellitic anhydride
method of passive immunity
microplates
no need
office manual
oszer
ozdemirs
pellitory of the wall
phase-detection
Pitarinae
plastic metal ceramic composite
plexus rectalis inferior
potential stock
predefining
principle of disclosure
pupa dermata
pushback
pyroninophilic cells
radiator screw-cap
ramillary
resilient packet ring
Reynolds model
samme
sec-alkylpenicillin
series-parallel contact network
smart interactive terminal
solenoid valve for gas
sparks-langer
speccing
structure fomula
suds-stabilizing agent
terza rimas
tumble drier
tunnel driving method
under deck cargo
Vela Hotel
venatic
vitamin P complex
water policy
West Monkton
yestreen