un. 二叠系;二叠纪
[网络] 二迭纪;二叠纪时期;期二叠纪
词型变化:名词复数形式 : permian periods
【近义词】

Grammar Girl here. This week I have two topics for you: The number of spaces after a period at the end of a sentence, and whether you should use who or that to refer to people (and pets). Now here's our first listener question. His friends believe it

发表于:2019-01-02 / 阅读(52) / 评论(0) 分类 英语语法 Grammar Girl

37 研究表明2500万年前流星曾碰撞过地球 DATE=4-18-01 TITLE=SCIENCE REPORT - Meteor Collision With Earth BYLINE=Jill Moss (Start at 59

发表于:2019-01-16 / 阅读(82) / 评论(0) 分类 科技之光

很多打算赴国外留学的同学现在已经在联系租房的事了,在国外租房的时候一定要签订正式的租约(lease)或住房合同(housing contract),这有时候也被称为租房协议(rental agreement)。 租房合同里大家要

发表于:2019-02-02 / 阅读(54) / 评论(0) 分类 实用英语

Science and technology 科学技术 Mass extinctions 大灭绝 Small but deadly 陨石很小不过危害却很致命 The biggest extinction in history was probably caused by a space rock that changed the climate 历史上规模最大的一次物种灭绝

发表于:2019-02-06 / 阅读(27) / 评论(0) 分类 经济学人科技系列

BEIJING, Feb. 16 (Xinhua) -- The Ministry of Transport (MOT) said Thursday that about 2.85 billion passenger-trips by roads were made during the 40-day Spring Festival travel rush this year, up 9.6 percent from the corresponding period last year. A t

发表于:2019-02-07 / 阅读(150) / 评论(0) 分类 英语新闻

Earth has seen five major extinction episodes in its time the Ordovician, Devonian, Permian, Triassic, and Cretaceous, in that order and many smaller ones. 地球已经目睹了5次大的灭绝事件依次在奥陶纪、泥盆纪、二叠纪、三叠纪

发表于:2019-02-17 / 阅读(35) / 评论(0) 分类 万物简史
学英语单词
-city
AAPSO
abuses
acidic extractant
aerodynamic noise test
age class table
akbarum
all-purpose detergent
armisted
audit area selection
automatic batching equipment
axis of reference
azochinin
besnier prurigo diathesique
Better be a fool than a knave.
bikies
bronchotomies
bruckenthalia spiculifolias
car-mechanic
cardston
Chadband
Cherskogo, Khrebet
chip mark
circle mode
come-over
consiliums
denworth
departmentstore
desoxycytidine
dezmond
dioptra
Driebergen
Dry L.
earth return system
engine crossfeed
ented
equilibrous
euallele
format plot area
Fosalina
framed dome
Ghazakh
gymnothorax fimbriatus
hashanah
hattiest
haultain
hematonosis
hexanicit
hypothesizes
in no small part
inter access
international children's day
Kadrifakovo
Kirkjubær
law of independent assortment
limiting intensity
lowentina
lupus sclerosus
macropipelining algorithm
mandibulata mouth parts
market belief heuristic
matter-antimatter cosmology
military discipline
next event synchronous simulation
non-heterosexual
optical neural networks
outdoorish
paravertebral anesthesia
photochemical activity
photopathology
phytogenic rock
picric-nitric acid
premonition
proctolin
readjust faculties and specialities
region analysis
rematerialisation
restrictions
rhetorical questions
rubbas
scope cover
SD-43775
seed forest
Shallow-rootedness
sheath-anchor
sophomoric
sparenesses
spiro-amantadine
strong name
subaortic mesenchyme
swamp poplars
Syzygium euphlebium
targeteers
the frozen mitt
tip-tilteds
tree injection
veeblender
veniality
weft cop
well proportioned
WLM (working level month)
zind