时间:2018-12-18 作者:英语课 分类:大学四六级阅读


英语课

   数词


  表示数目多少或顺序多少的词叫数词,数词分为基数词和序数词。表示数目多少的数词叫基数词;表示顺序的数词叫序数词。
  一、基数词
  1)基数词写法和读法: 345 three hundred and forty-five;
  2)基数词一般是单数形式,但下列情况,常用复数:
  a. 与of 短语连用,表示概数,不能与具体数目连 用,如scores of people 指许多人;
  b. 在一些表示"一排"或"一组"的词组里;
  如:They arrived in twos and threes. 他们三三两两的到达了。
  c. 表示"几十岁";考试大,考试伴你同行
  d. 表示"年代",用 in +the +数词复数;
  e. 在乘法运算的一种表示法里,如:3 x 5 = 15 Three fives is (are) fifteen.
  二、序数词
  序数词的缩写形式: first---1st second---2nd thirty-first---31st
  三、 数词的用法
  1)倍数表示法
  a. 主语+谓语+倍数(或分数)+ as + adj. + as
  I have three times as many as you. 我有你三倍那么多。
  b. 主语+谓语+倍数(分数)+ the size (amount,length…) of…
  The earth is 49 times the size of the moon. 地球是月球的49倍。
  c. 主语+谓语+倍数(分数)+ 形容词(副词)比较级+ than…
  The grain output 1 is 8 percent higher this year than that of last year.
  今年比去年粮食产量增加8%。
  d. 还可以用by+倍数,表示增加多少倍
  The production of grain has been increased by four times this year.
  今年粮食产量增加了4倍。
  2)分数表示法
  构成:基数词代表分子,序数词代表分母。分子大于1时,分子的序数词用单数,分母序数词用复数:
  1/3 one-third ; 3/37 three and three-sevenths.

1 output
n.产量,输出,输出功率,输出端;vt.输出(信息等)
  • Grain output reached a new high in the three years.谷物产量达到三年中最高水平。
  • The chart showed us the global output of a factory.这张图表展示了一个工厂的总产量。
标签: 英语六级
学英语单词
activation model of memory
active hydrogen atom
acute fatty liver of pregnancy
affective reactiontype
aluminium cell lightning arrester
Amixyl
ansi standards
aqueous desert
atomic mass conversion factor
aveda
aviation safety information
banerji
benedi
bet one's life
birchbarks
block-structured list
calcified tissue
categorical dual
Chromocor
Cognin
common spotted orchid
computer output microfilming
continuous background
Corinthian spirits
cuticular clarite
diplet
drop scenery
ecological ethics
Eibergen
engelwood
fibre needle
finding of law
float mineral
freeze sinking method
front for sth
got warm
grapnel traveling crane
Grebbestad
hackney coaches
hidle
hold a reunion
homologous line pair
husband's
hydantol
hyperreaction
information system security administrator
instantaneous deviation control circuit
iso-agglutinin
lens of extreme aperture
leopard lizards
likewake
loafpan
loose joint hinge
main insulation
mbacke
measured variable
memo motion study
molding composition
Morges
movabler
nazaritic
Neptune powder
once through cracking
open-flow test
pellet chain
perforated ray cell
petrochemical materials
photo-ceram
photophysics
piaculary
pirogi
poore-blind
Pyrochep
quett
r(h)achis
receivabless
refuse combustion gas
rehires
rental cost
selachii
shepherd moons
shower maximum
signed rank
simulation algorithm
smallprints
softship
spray characteristic
startupper
steelyard
Sterigmatocystis
strike risks
strongly oxidizing slag
thunder storm electricity
thyrotoxic crisis
took hold of
trimeresurus gramineus stejnegeri
two-phase machine
urezigenin
wastorels
white stone chippings
xyelids