音标:[ˈpɔzitivz] ;
n. 确实( positive的复数形式 ); 正片; <语>原级形容词; 明确性
n. the primary form of an adjective or adverb; denotes a quality without qualification, comparison, or relation to increase or diminution
n. a film showing a photographic image whose tones correspond to those of the original subject

Frog census volunteers misinterpreted recorded frog sounds in the field, leading researchers to suspect that frog populations may be even lower than thought. Declining frog populations are considered an indicator of environmental damage. But new rese

发表于:2019-01-02 / 阅读(135) / 评论(0) 分类 60秒科学

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute Declining frog populations are considered an indicator of environmental damage. But new research finds that frogs might be doing even worse than we thou

发表于:2019-01-08 / 阅读(89) / 评论(0) 分类 Scientific American(八)月

Larry和李华一起坐地铁回家。今天我们要学两个常用语:get the ball rolling和mull it over. LH: Larry, 这两天天气真好,我看,过不了多久树就要发芽了。我真巴不得春天马上就到。 LL: Me too. I can't wa

发表于:2019-01-15 / 阅读(83) / 评论(0) 分类 美国之音《流行美语》

Grammar Girl here. Todays topic is appositives. Guest-writer Bonnie Trenga writes, Today we have to decide if information is essential or extra, because if its extra well need some extra commas. The concept Im referring to is called an appositive. A

发表于:2019-01-30 / 阅读(172) / 评论(0) 分类 英语语法 Grammar Girl
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air attache
alloy hardener
Alpinia oui
analyst backlog
anti-evolutionary
atherinomorus pinguis
autonomous learning
bagged garbage
block prefix
brazed vessel
Butvar adhesive
charcutiers
chromosome mobilization
citramalase
colitoxin
comis
compound semiannually
conjugated group
cullambine
curlicue fractal
cut-off shaft
dance attendance on sb
decentralization of authority and responsibility
deeny
dihydroxydurene
disencouragement
disposable tape reel
dlouh
dramseller
e-readers
effluxion
electric violinist
errhina
ethno-religious
feeder ratchet stop link
foreign exchange budget
free vehicle respirometer
fungia (verrillofungia) repanda
gamages
gastrulations
genus Vedalia
glass-blowers' disease
grandstanders
hot floor drier
ijma'
immune response
in great numbers
instersecting axis
interconnected networks
interference of light filter
isopentanized
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kickshawses
Lamarck
lateral margin
level compensation
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mangano columbite
Marmolada, Pta.la
mascoutah
memoriter
Menen(Menin)
mesural music
multiplex tderminal
N-acetylglucosamine-6-sulfatase
nerve supply
North American porcupine
not file protection
packed tower
painshills
pairing of interlaced field
payee's account
photoneutron source
plague the life out of
polyphosphoesters
Pontrilas
post-mortem suture
Priestley, John Boynton
primitive community
quenching machine
refined mesh
SCD (severe core damage)
sedimetry
shell envelope framing
sight-sound synchronization
silky-leafed
single-event
skein cells
spaghetti tubing
sucking in
syrian-iranian
Tiselius
to have one foot in the grave
trichloroethyl urethan
turn the frown upside down
universal hydrometer
Vandzene
video transmitter
zebra roof
zone of confusion
zulie