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## 以 t 开头的数学词汇

2012-10-08
table   表，表格
An arrangement of information or data into columns and rows or a condensed list.

tangent   正切；切线

• For a given angle in a right-angled triangle, a trigonometric function equal to the length of the side opposite the angle divided by the length of the adjacent side.
• Let P be a point on a curve, the tangent to the curve at P is the line through P that touches the curve at P, but never cross or intersect the curve.

tangram   七巧板
A Chinese puzzle consisting of a square cut into five triangles, a square, and a rhomboid, to be reassembled into different figures.

temperature   温度
A measure of the warmth or coldness of an object or substance with reference to some standard value.

tenth   第十；十分之一

• The ordinal number matching the number ten in a series.
• One of ten equal parts.

term   项
Each of the members of which a mathematical expression, a series of quantities, or the composed.

terminating decimal   有限小数
A decimal that has only a finite number of nonzero digits to the right of the decimal point. Also known as finite decimal.

tetragon   四边形
A polygon with four sides and four angles.

tetrahedron   四面体
A solid figure having four plane faces. A regular tetrahedron has faces that are equilateral triangles.

theorem   定理，法则
A proposition, statement, that has been or is to be proved on the basis of explicit assumptions.

thermometer   温度计
An instrument for measuring temperature, especially one having a graduated glass tube with a bulb containing a liquid, typically mercury or colored alcohol, that expands and rises in the tube as the temperature increases.

thousand   千

• The number 1,000.
• The fourth digit to the left of the decimal point in the decimal number system.

three-dimensional   三维，立体
Existing in three dimensions, possessing or appearing to possess the dimensions of height, width, and depth.

thrice   三次
Three times.

time   时间

• The system of those sequential relations that any event has to any other, as past, present, or future; indefinite and continuous duration regarded as that in which events succeed one another.
• Duration regarded as belonging to the present life as distinct from the life to come or from eternity; finite duration.
• A system or method of measuring or reckoning the passage of time: mean time; apparent time; Greenwich Time.

time line   时间线

• A schedule, timetable: a plan of when something should happen or how much time something should take.
• A line showing particular dates over a period of time.

time value of money   资金的时间价值
Describes the greater benefit of receiving money now rather than later. It explains why interest is paid or earned: Interest, whether it is on a bank deposit or debt, compensates the depositor or lender for the time value of money.

times tables   乘法表
A table, used as an aid in memorization, that lists the products of certain numbers multiplied together, typically the numbers 1 to 12.

timetable   时间表
A schedule listing the times at which certain events, such as arrivals and departures at a transportation station, are expected to take place.

tonne   公吨
A unit for measuring weight, equal to 1 000 kilograms or 2204.6 pounds. Also called (not in technical use): metric ton.

top view   顶视图

total   一共
An amount obtained by addition; a sum.

transformation   转换

• A relation between two sets in which one element of the second set is assigned to each element of the first set, as the expression y = x2.
• A change in the position or direction of the axes of a mathematical coordinate system without changing their relative angles. A mapping of one space onto another or onto itself.

translate   平移
Change the position of (figures or bodies) in space without rotation, dilation, or angular displacement.

transversal   截线的
A line intersecting two or more lines.

trapezium   不规则四边形
A quadrilateral having no parallel sides.

trapezoid   梯形
A quadrilateral having two parallel and two nonparallel sides.

treble   三倍，三重
Threefold; three times the amount, size, etc.

trend line   趋势线
An upward or downward line on a chart indicating movements of average prices, as of stocks, over a period of time.

triangle   三角形
The plane figure formed by connecting three points not in a straight line by straight line segments; a three-sided polygon.

triangle inequality theorem   三角不等式定理
For real or complex numbers or vectors in a normed space x and y, the absolute value or norm of x + y is less than or equal to the sum of the absolute values or norms of x and y.

triangular number   三角数
A triangular number or triangle number counts the objects that can form an equilateral triangle, as in the diagram on the right. The nth triangular number is the number of dots composing a triangle with n dots on a side, and is equal to the sum of the n natural numbers from 1 to n. The sequence of triangular numbers starting at the 0th triangular number, is 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666…

triangular prism   三棱柱
A three-sided prism; it is a polyhedron made of a triangular base. Equivalently, it is a polyhedron of which two faces are parallel, while the surface normals of the other three are in the same plane (which is not necessarily parallel to the base planes). These three faces are parallelograms. All cross-sections parallel to the base faces are the same triangle.

trigonometry   三角学
The branch of mathematics that deals with the relations between the sides and angles of plane or spherical triangles, and the calculations based on them.

trillion   兆
A cardinal number represented in the U.S. by 1 followed by 12 zeros, 1012, a million million. While in Great Britain by 1 followed by 18 zeros, 1018, a million million million.

trinomial   三项式
An expression that is a sum or difference of three terms, as 3x + 2y + z or 3x122 + 2x2 + x.

triple   三倍
Three times as great, as much, or as many.

turn   翻转
To move sth so that it is in a different position or facing a different direction.

twice   两倍，两次

• In double the amount or degree.
• Two times; on two occasions.

two-dimensional   二维
Describes a figure that has length and width but no depth, e.g. a geometric figure on a single plane.

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