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
absail
air-drying loss
Akou
allowable deductious
antioxidant BLE
be in the middle of sth
behavioral accounting
betemme
bilinear balanced map
body drop
bollard bolometer
bucket packing ring
burkitt's african lymphoma
cavafy
cooling blood and dissolving purpura
correct and copy
corruption prevention
cowhiding
cyps
decnets
differential porosity
diltawa (al khalis)
dispel heat from blood to stop bleeding
doctrine of utterance
Drepano
duplex paper
Elswick
ensheltering
epicentre,epicenter
filetype
fixed electrode method
flat sawed lumber
flat-hatted
fluid stress
formation
full-courser
gas house
genus Acipenser
get into the way of
graphane
Guarico, Pta.
have one's work cut out
Helen Porter Mitchell
helical cutting
hemorrhagic pustular smallpox
horizontal band
insectarium
intra-plant telephone
kevalin
lash down the silverware
liberi non justi
local view
Mahenge
majority
meristematic cell
merothrips laevis
mild and indirect
modular unit for transfer line
modulation products
Movement for the Fifth Republic
multi-resonant circuit
nicto
north of sth
not far out
o'steen
one-stoplight
original argument
oryza eichingeri
oxygenicity
Pamyat' Parizhskoy Kommuny
parcinary
periodontal surgical instrumentarium
PID (proportional-integral-differential)
plasma substitute
polmeristion
price override flag
prie-dieu
radex(radiation exclusion)
recodifying
relaying protection
respirato-
return valve
scind
secobarbitals
shock proof socket
shovelloader
snes
stryngest
subareolar
sulpho-salts
system high security mode
tamasheq
tow and assist clause
universal pressure
ursal
Uthai Thani, Changwat
vena appendiculariss
vitez
voulges
Weather Underground
wellcraft
Yauza