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 good plot of tree
abc-owned
about-sledges
aggregate income payment
aggressing
arrest muscle
aurant-
bath times
be SOL
becket line
bed clothing
black gang
blearing
caffeoyl guinic acid
carmintive
catcher gap
central axis of urban planning
Chadwicks
contejean butter
continuous ion exchange operation
coseps
counterilluminated
cowcatcher
cup anemometer
Dalbergieae
deep layer bed
double degree
doublet soap
dyspraxics
ecotope adaptation
EHF
eleometer
enseignment
epithelial ridges
equabler
erosion pit
expansion cleat
extendedbackground
fallow deer
fibrohemosideric sarcoma
finger-fuckin'
Foreign Acceptances
gain-ground
ganglia (pl. of ganglion)
glass sign board
glove puppets
glutamycin
greaterer
green concrete
guarde
Incisura trochlearis
infinite membrane
laughing owl
leacocks
least digit significant
LFCC
made merry with
mass-spectrometer tube
material lock
mensuration by parts
micro-alignment telescope
midgastrula
minutious
mixed capillary-cavernous hemangioma
mixed minefield
monocrystalline semiconductor
motor transport handling station
noisy blacks
oxhearts
pagurodofleinia doederleini
pectoral branches
pharmaceutical affairs law and regulation
plain chart
potential box
pre date
pre-cursors
preliminary action
radiomutations
rice-farming
schlieren photography
second-rate
sensing station
sero-mucous cells
single channel radiometer
spideries
step-by step computation
stratigraphic
strete
tariff reform
the kgb
to thine own self be true
tunnel diode memory
undee
upwell
ureametry
V-notch impact test
want the best of both worlds
wedge slit
what the hey!
wideness
worker-student
zivonik