# [转载]数学英语2

数学图形的基本内容

1

2

3

Concavity：

4

5

6

7

8

9

​英文描述举例

（每个人语言习惯千差万别，举例描述，不作为唯一或最佳表达依据）

Eng: The graph is captioned: y equals x squared minus two x, a parabola.

caption作为名词意思是“标题”，这里是一个动词“加上标题”的意思。

squared平方，minus减

Eng: The graph has x and y axes and the scale for both axes is in units of one, labeled from minus three to plus three.

"轴"的英文为axis（复数axes）

unit为x/y轴的单位，这里默认为“1”，很多时候是其他单位，比如x轴以时间“秒”为单位要说成“in units of one second”

minus除了“减”还用来表示负数，同理plus除了“加”也表示正数。

label指一个图中的所有标记，比如1, -1, x, y，点A，点B等都是label。

(为了方便阅读，这张图会多次出现)

Eng: The shape of the graph is a parabola, concave up (or parabola openning up)

Eng: It is symmetric about the vertical line x equals one.

symmetric是形容词对称的；名词是symmetry

vertical是垂直的，vertical line就是垂直的线。

“x=1时的垂直线”包含了中文表达的“轴”和“左右”的意思。

Eng: The graph begins in the second quadrant and decreases steeply. It crosses the origin and goes down into the fourth quadrant.

Eng: When x equals to 1, it reaches the minimum. The vertex coordinate is one, minus one.

vertex顶点；coordinate坐标

Eng: The parabola then changes direction to go up and crosses the x-axis at the point two, zero moves into the first quadrant and continues go up.

Eng: The graph is captioned: the step function:

step function：分段函数，也称阶梯函数

Eng: y equals minus three, when x is less than minus two.

Eng: y equals zero, when minus two is less than or equal to x is less than or equal to one.

Eng: and y equals three, when x is greater than one.

Eng: The graph has x-and y-axes and the scale for both axes is in units of one, labeled from minus five to plus five.

Eng: The graph consists of three disjoint horizontal line segments parallel to the x-axis

line segment：线段.

Eng: The first line segment is entirely contained in the fourth quadrant. It is located aty equals minus three when x is less than minus two.

Eng: The second line segment begins at the point minus two, zero, crosses the origin and ends at the point one, zero. It is located at y equals zero for x greater than or equal to minus 2 and less than or equal to one. It begins at the point minus two, zero, crosses the origin and ends at the point one, zero.

Eng: The third line segment is entirely contained in the fourth quadrant. It is located at y equals three when x is greater than one.

https://blog.sciencenet.cn/blog-1089082-1362481.html

## 全部精选博文导读

GMT+8, 2024-6-17 00:28