表示“每隔……”等的数词用法
“每隔……”的表达法、译法、转换及注意事项
    一、表达方法:
1. every+基数词(大于或等于2)复数名词 意思是“每……”。例如:
The old man went to hospital every five days. 那老汉每五天/每隔四天就去看一次病.
There are buses to the station every ten minutes.每十分钟/每隔九分钟就有公共汽车去火车站.
We hand in our homework every three days. 我们每三天每隔两天交一次作业。
2. every+序数词(大于或等于2)单数名词”意思是“每……”。例如:
The Olympic Games are held every fourth year. 奥林匹克运动会每四年/每隔三年举办一次。
He comes to see his uncle every third week.他每三周/每隔两周来看望他的叔叔。
3. every other +基数词(大于或等于2) 复数名词” 意思是“每……”。例如:
I have to work out every other two days. 我每隔两天就要作一次运动。
I had to sit down and rest every other four minutes. 我每隔4分钟就得坐下休息。
4. every other +零基数词(等于1)+单数名词 意思是“每隔一……例如:
Take this medicine every other day. 这药每两天/每隔一天服一次。
Please write down these new words on every other line. 请把这些生词隔行写下来。
5.every few 复数名词” 意思是“每隔几…… 例如:
He came to see me every few days. 他每隔几天来看我一次。
He stopped and turned around every few meters. 他每走几步就停下来向四周看一看。
二、译法:
1. 从上面的例句中可以看出,在every+基数词(大于或等于2)复数名词 every+序数词(大于或等于2)单数名词”中,在表示空间一点和时间时,every 既可译成“每……”,也可译成每隔……。译成每隔……时,汉语和英语不同,要在英语所给数字中减去一,即n-1,但表示距离时,译成每……每隔……,在意义上差别不大,英汉互译在数
字上则是一致的。例如:
The doctor told him to take the medicine every four hours/every fourth hour. 医生让他每四个小时每隔三小时吃一次药。
I write to him every two weeks/every second week. 我每两周/每隔一周给他写封信。
There's a post box every 500 meters. 每/每隔500米就有一个邮箱.
We were asked to plant a tree every twenty meters on both sides of the road.
要求我们在马路两旁每隔20米栽一棵树。
Change the oil in the car every 5,000 miles. 每行5000里给汽车换一次油。
2. every所修饰的数字大到一定程度时,译成……”或“每隔……,意义上差别不大。例如:
The doctor visits his mother every hundred days. 这位医生每/每隔一百天去看望他母亲一次。
    三、转换:He goes to town every two days/every second/other day. 他每两天/每隔一天进城一次。
Mary goes to see her grandparents every three days/every third day/every other two days.  玛丽每三天每隔两天去看望她祖父母一次。
四、注意事项:everyeach虽为同义词,但在表达“每隔……”时,不能用each来替代every
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 (amountlength…) 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 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。
序号表示法
1 单纯的,序号可在基数词前加numberpresent的同义词,写为。如:No.1第一号。
2 事物名词的序号表达法有所不同
  a  对于一些小序号可用序数词也可用基数词表达。形式分别为:the+序数词+名词;名词+基数词。如:第一次世界大战可以表示为The First World/ World War One.
  b 对于一些大序号我们通常只用一种表达法,即名词+数词。如;501号房间表示为room501538路公共汽车表示为bus538
  c 可用a/the+number+基数词+名词。如:a No.5 bus一辆五路公共汽车,the No.8 bus
辆八路公共汽车。
1 ten/dozen/score/hundred/thousand/million等数词的复数后加of短语来表示几十,几百 上千,成千上万等大约数概念。如:
  The little boy buys dozens of pencils every term.
  Thousands of people died in the earthquake.
2 more than,over, above beyond, or more等来表示超过或多余某个数目。如
  Peking University has a history of more than 100 years.
3 less than, under, below, almost,nearly,up to等来表示小于或接近某数。如:
    He is good  at English,so he can finish it in less than two hours.
4 or,or so,about, around, some, more or less等表示在某个数目左右。
    About 50 people were present at that time.
5 to, from--- to---,between---and表示介于数间。
    His salary rises from 20 dollars to a week to 35 dollars a week.
6 注意dozen, score, hundred,thousand,million作数词连确切数词,不用复数。如:
    three score;five dozen; seven million.
分数的表达法
1 分子用基数词,分母用序数词,分子大于1,分母用复数。如:三分之一,one-third;七分之三, three-sevenths
2 分子与分母之间加in,分子在前,分母在后,分子分母都用基数词。如:十分之一,one in ten;五分之八,eight in five
3 分子与分母之间加out of,分子在前,分母在后,分子分母都用基数词one out of ten; five out of eight.
百分数的表示法
  1直接将数词放在percent前面即可。 twenty percent为百分之二十。
表示整岁,直接用基数词或yearage,例如20可表示为:
  He is twenty
  He is twenty years old
  He is a twenty-year-old man
  He is aged twenty
  He is at the age of twenty
  He is twenty years of age
He is at age twenty

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