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1、1专业英语中的常用符号和数学式的表达1/2 a half, one half1/3 a third, one third2/3 two thirds1/4 a quarter, one quarter, a fourth, one fourth1/100 a(one) hundredth1/1000 a(one) thousandth113/324 one hundred and thirteen over three hundred and twenty four four and two thirds2430.25 zero (0, naught) point two five+ plus
2、 , positive_ minus, negative plus or minus multiplied by , times divided by= be equal to, equals be approximately equal to, approximately equals() round brackets; parentheses【】 square (angular) brackets braces less than or equal to 2 more than or equal to infinity because thereforemaps intoX+y x plu
3、s y(a+b) bracket a plus b bracket closedA=b a equals b; a is equal to b; a is bAb a is not equal to bAb a plus or minus bAb a is approximately equal to bAb a is greater than bAb a is muchfar greater than bAb a is less than bAb a is much less than bAb a is perpendicular to bX x approaches infinityAb
4、a is identically equal to b; a is of identity to ba angle aAb the difference between a and bAb a is parallel to bAb a varies directly as b3: x square; x squared; the square of x; the second 2power of x; x to second power: x cube; x cubed; the cube of x; the third power 3of x; x to the third powerthe
5、 square root of xxthe cube root of x3% percent2% two percent per mill5 five per mill log x to the base nlognxlog x to the base 10; common logarithm10, log x to the base e; natural logarithm; lexlnapierian logarithm, exponential function of x;e to the power xxep()the nth power of x; x to the power nn
6、或 the nth root of x; x to the power one 1xnxover nSin sineCos cosineTg, tan tangentCtg, cot cotangent4Sc, sec secontCsc, coses cosecant, arcsin : arc sine 1sin, arcos : arc cosinecoSinh : the hyperbolic sineCosh: the hyperbolic cosine: the summation of : the summation of x sub I, where I goes from 1
7、 1nixto n: the product of : the absolute value of xx: the mean value of x; x bar: b prime: b double prime; b second prime: b triple prime: function f of xfx ； finite difference or increment: the increment of xx: dee x; dee of x; differential xd: the differential coefficient of y with respect to x; y
8、xthe first derivative of y with respect of x5: the second derivative of y with respect of x2dyx: the nth derivative of y with respect of xn: the partial derivative of y with respect of u, where yuy is a function of u and another variable(or variables): integral of : double integral of: n-fold integr
9、al of : integral between limits a and b (from a to b)ba: vector FF： a sub two220:twenty degrees7：seven minutes; seven feet13: thirteen seconds; thirteen inches0: zero degree centigradeCelsius100: one a hundred degrees Centigrade32: thirty-two degrees Fahrenheit6专业英语中常用的词缀1、名词词缀(prefix, suffix)词缀 意义
10、词例Auto Self 自己，自动 Automation 自动化, autoalarm 自动报警Counter Against，反，抗，对应 Counterbalance 均衡, countermeasure 干扰Deca Ten，十 Decagram 十克 , decameter 十米Deci 10% 十分之一 Decigram 十分之一克, decimeter 十分之一米Di Two 二 Dimensions 二维, diode 二极管Hector Hundred 一百 Hectowatt 百瓦, hectoampere 一百安培In In 入 Input 输入, intake 吸入Int
11、er Between, among 在之间 Interface 接口, internet 互联网Macro Large, long 大， 长，宏Macrocode 宏代码, macroinstruction 宏指令Micro Small 小 Microcomputer 微型计算机, microwave 微波Oct Eight 八 Octagen 八角形 , October 十月（古罗马八月）Out Out 出 Output 输出, outline 外形（线、图）Sub Beneath, less than，小于 Subconsole 辅助工作台, subduple 二分之一Tele Far a
12、way 远离 Telephone 电话, telegraph 电报Sym,syn Common, same 相同 Symmetry 对称, syntony 谐振，共振Acity 表示情况、性质、状态等 Capacity 容量Acy 表示性质、状态、行为等 Determinacy 确定性Age 表示抽象概念，如性质等 Voltage 电压Al 表示抽象概念 Removal 除去Ality 表示情况、性质、状态等 Conditionality 条件性Ance,ence 表示情况、性质、状态等 Resistance 电阻, difference 差异Ancy,ency 表示情况、性质、状态等 Eff
13、iciency 效率Cy 表示情况、性质、状态等 Accuracy 精确度Ic,ics 表示情况、性质、状态等 Electronics 电子学, physics 物理学Ing 表示情况、性质、状态等 Reading 读数 , recording 记录Ion,tion,sion,xion表示情况、性质、状态等 Connection 连接、链接, specification 规格Logy Subject 科目，学，论，法Methodology 方法学，方法论Ment 表示动作、性质、状态等 Movement 运动 , development 开发Ness 表示动作、性质、状态等 Hardness
14、硬度, robustness 强度Ship 表示动作、性质、状态等 Relationship 关系Th 表示动作、性质、状态等 Growth 增长Ty,ity 表示动作、性质、状态等 Reliability 可靠性, probability 概率Ure 表示动作、性质、状态等 Measure 测量 Er 表示人或物 Computer 计算机, controller 控制器7Or 表示人或物 Operator 操作员 , sensor 传感器ist 表示人 Scientist 科学家2、形容词词缀词缀 意义 词例-able ,-ible 表示可能性 Readable 可读的, enable 使能-al 表示的 Lateral 横向的 , virtual 虚拟的-ant,-ent 表示的 Important 重要的 , independent 独立的-ar,
