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(114) / 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(66) / 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(64) / 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(155) / 评论(0) 分类 英语语法 Grammar Girl
学英语单词
adolescent pathology
alka
alphabetical
Ammersbek
analyzer
anemometers
angioautotomography
arbitration timing
autofisher
b.n.f.jet test
Bembridae
boom microphone
bubble tea
buyup
Callichthyidae
capronor
charity bazar
Cimabue, Giovanni
clod eliminator
compatibility of constraint
concrete roof
conjunctival veinss
cramoisies
deferred experimental and research expenses
dendroecologist
dozens of
Drabeši
drip-sheet
drugresistance
dynamic temperature difference
Echinops tricholepis
enolphosphopyruvic acid
equitable claims and defences
EVHM (ex-vessel handling machine)
failure-to-start
fastener of dead-line
feedforward compensation
First-Time Homebuyer
fontware
foreign community
frequency modulation characteristic
fullartons
general arrangement plan
Glesborg
grass building machinery
halloo
hereditary plasticity
high lubrication polyoxymethylene
horizontal centrifugal pump
Hughes, Howard(Robard)
hyperiids
IDWS
immunologic surveillance hypothesis
insurance-oriented
inter-phase coupling
ionization efficiency
keen on
Kyohang-ni
lactomucin
laser heterodyne spectrometer (lhs)
lazy leucocyte syndrome
maoyancaosu
mathematical instruments
maximum welding power
mirror-nearer merger
moulding sand composition
neophyte
noncultivation
nonmerculic fungicide
not know enough to go in when it rains
nunnely
out-prize
palaeophytology
phenomenalizing
pituitary portal system
quadrangulated
radar track position
recapitulator
red harring
red lead putty
rtta
serial radiographic apparatus
Serrucho, Cerro
shoe repairs
shown her teeth
sporadick
stanniol steel bimetal sheet
studial
sulphamoylated
taeniid
tapping table
tear ... away
telegrid
the prime meridian
tightly wound arm
upflow contact clarifier
us landing
white globe lily
woodwind
young's fringe
ysprong
zooplastic graft