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Addition
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加法
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Mathematical Operation to return the sum of two or more summands
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数学运算，返回两个或多个求和之和
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Subtraction
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减法
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Mathematical Operation to return the difference of minuend and subtrahend
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返回 minuend 和 subtrahend 之差的数学运算
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Multiplication
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乘法
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Mathematical Operation to return the product of multiplier and multiplicant
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返回乘数和被乘数乘积的数学运算
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Division
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部门
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Mathematical Operation to return the fraction of divident and divisor
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返回被除数和除数分数的数学运算
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Modulus
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模
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Mathematical Operation to return the remainder of a division of two integers
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数学运算，返回两个整数的除法的余数
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Exponentiation - PHP5.6 or above required
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幂运算 - 需要 PHP5.6 或以上
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Mathematical Operation to return the repeated multiplication (or division) of a base by its exponent.
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Mathematical Operation 返回底数乘以指数的重复乘法（或除法）。
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Decimal Mark
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小数点
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Decimal Mark used to separate the integer part from the fractional part
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表示整数部分结束和小数部分开头的符号
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Round Bracket
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圆括号
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Used to override normal precedence or to mark the first level of nesting
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用于覆盖正常优先级或标记第一级嵌套
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Square Bracket
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方括号
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Used to override normal precedence or to mark the second level of nesting
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用于覆盖正常优先级或标记第二级嵌套
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Punctuation mark
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标点符号
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Used to separate arguments forwarded to a function
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用于分隔转发给函数的参数
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