数学（4）

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Permutation is an ordered arrangement of the elements of a set

排列是指集合元素的有序排序方式。

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In the Cartesian coordinate system , the point (3 , -2 ) lies in the fourth quadrant

在笛卡尔坐标系中，点（3，-2）位于第四象限。

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A quotient is the number obtained by dividing one quantity by another

商是通过将一个数除以另一个数得到的数字。

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Reducing a fraction to its lowest terms simplifies the numerical expression

将分数约分为最简形式可简化数值表达式。

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The metric system is a decimal system

公制是一个十进制系统。

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The diameter of a circle is twice the length of its radius

圆的直径是半径长度的两倍。

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Planets orbit the sun in elliptical paths rather than perfect circles

行星以椭圆轨道而非正圆轨道围绕太阳运行。

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A line segment that joins the center of a circle with any point on its circumference is a radius

半径是指连接圆心和圆周上任意一点的线段。

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Vertical communication happens between subordinates and superiors

发生在上下级间的纵向沟通。

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Tax deduction policies aim to encourage specific economic behaviors , such as investment or charity

税收减免政策旨在鼓励特定经济行为，如投资或慈善。

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Statistics show a correlation between smoking and an increased risk of heart disease

统计数据表明吸烟与心脏病风险增加之间存在关联。

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2 ,4 ,6 ,8 etc . are even numbers

2,4,6,8等是偶数

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1 ,3 ,5 ,7 etc . are odd numbers

1,3,5,7等是奇数。