英语中倍数的表达方式.doc

英语中倍数的表达方式一、用 times 表示倍数（一般限于包括基数在内三倍或三倍以上的数。表示两倍的数，一般用 twice ）。其句式有：1. “ times 形容词 / 副词的比较级 than ”例如：Line AB is three times longer than line CD.线段 AB 是（线段） CD 的三倍长。 This hall is five times bigger than our classroom.这个大厅比我们的教室大 5 倍。2. “ times +as + 形容词 / 副词的原级 as ”例如：This table is three times as long as that one.这张桌子是那张桌子的三倍长。This dictionary is five times as thick as the one you borrowed from the library.这本词典的厚度是你从图书馆借的那本（厚度）的 5 倍。3. “ times + the + 名词（如： size， height， weight， length， width 等） of ”例如：The earth is 49 times the size of the moon.地球的体积是月球的 49 倍。This river is three times the depth of that one.这条河是那条河的三倍深。4. “ times + more 名词 than ”例如：He earns five times more money than he did ten years ago.他现在挣的钱比十年前挣的多 5 倍。There are twice more students in our class than in theirs.我们班的学生人数比他们班多两倍。5. “ times +as many （或 much ）名词 as ”例如：Weve produced twice as much cotton this year as （ we did ） ten years ago.今年我们生产的棉花比十年前多了一倍。（汉语中的多一倍实际上也指两倍一样多。）He has got three times as many books as his sister.他拥有的书的数量是他妹妹的 3 倍。6. “ times + what 从句”例如：The length of the road is four times what it was three years ago.这条路的长度是三年前的 4 倍。The price of the meat is twice what it was last year.肉价是去年的两倍。7. “ times + up on （或 over ）”例如：The size of the sun is a million times over that of the earth.太阳的体积比地球的体积大一百万倍。He is three times up on your age.他的年龄是你的 4 倍（或：比你的年龄大 3 倍）。8. “ +by + times ”例如：Compared with last year， our coal output has increased by three times.与去年相比，我们的煤产量增长了 3 倍。答：如蚂蚁、蝗虫、蚕蛾、蚜虫、蟋蟀、蝉、蝴蝶、蜜蜂、七星瓢虫等。His speed is faster than mine by four times.第三单元 宇 宙他的速度比我的快 4 倍。9. “ times + compared with 被比较对象”例如：4、如何借助大熊座找到北极星？（P58）The number of the students in our school has increased for times compared with 1980.我们学校的学生人数比 1980 年增加了 3 倍。14、大我数地区的自来水水源取自水库、湖泊或河流。自来水是主要的饮用水，饮用水源受到污染，会直接影响我们的身体健康。10. “ times + that of + 被比较对象”例如：In this workshop the output of July was 3.5 times that of January.一、填空：这个车间七月份的产量是元月份的 3.5 倍。二、用分数、百分数表示倍数。例如：14、在太阳周围的八颗大行星，它们是水星、金星、地球、火星、木星、土星、天王星、海王星。The box is one-third bigger than that one.这个盒子比那个盒子大三分之一。Last year the output value of industry was 59 percent higher than that of 1976.13、1663年，英国科学家罗伯特.胡克用自制的复合显微镜观察一块软木薄片的结构，发现它们看上去像一间间长方形的小房间，就把它命名为细胞。去年工业产值比 1976 年增长了 59 。My command of English is not half so good as yours.我英语掌握得还不及你的一半儿好。4、举例说明微生物对人类有益的方面是什么？三、用 again （一倍）， double （两倍）， triple （三倍）， fourfold （四倍）等词表示倍数。例如：My Aunt is as old again as I am.20、对生活垃圾进行分类、分装，这是我们每个公民的义务。只要我们人人参与，养成良好的习惯，我们周围的环境一定会变得更加清洁和美丽。我姑姑的年龄比我大一倍。The top-brand clothes are often sold as double the normal price here.这里名牌衣服的售价经常比正常的售价高一倍。The new work procedure tripled the output.新工艺使产量增加两倍。The output of grain increased fourfold.1、月球是地球的卫星，月球围绕着地球运动，运动的方向是逆时针方向。粮食产量增加了三倍。