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
astragalus glycyphylloss
asymmetric hull
aureolineatus
Baana
Batzhausen
bernardoes
bid-rent curve
blow-pipe reaction
blue mockingbird
board chronometer
Bottoming cycle
butt entry
catch all steam separator
category rating scale
central node
chain homotopy
chopping drum
coastal jurisdiction
comminglement
conducting liquid
coulons
crossing of the rolls
cytotoxicity test
dead-melt
Digital Powerline
diluted material
direct-coupled transistor logic
dojo
dommartin
double-float conversion
empoldered
equitable ownership
ethoxynaphthalene
exothermicities
free fall lifeboat
frequency modulation carrier telegraph
goosanders
haloalcohols
hellfighters
installations
isotopic exchange
king spoke
kitchen timer
lactose-controlled diet
Lignum Santali Albi
loan commission
locomotive kilometers
mackerelage
marasmolite
marit
megakaryocytopenia
mesocolon transversum
microfractionator
MS SQL
national communications information plan
network meeting
neurogenin
nontracking precision clock
norvell
nubbin cut off machine
obra
oenomels
oil warm-up torch
only when
otorrhea
P'albongsan
packrattery
pholania
piquantnesses
point smoke
pray TV
product diversification
projected cost of goods manufactured
remiform
reproduction ages
resale price
ridge of labial arch
roll in the aisle
saarlouiss
samariscus filipectoralis
sand reclaimer
sandrils
sluchched
sniffy
solution of game
starkies
steam in
Tamsui
Tayalic
the gray mare
thoracoplasty
thumb piano
time-was
Tournon
U0L system
valacidin
veterinary surgery skill
wage and salary administration
wire side
wooden spike
Ymodem