表达式的用法和样例：
例句
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在COBOL系统中，由一个数据项、算术表达式或条件表达式表示的信息。
In the COBOL system, the information represented by a data item, arithmetic expression, or conditional expression. -
方括弧，中括号符号之一，用于托住一手写或印刷或标明被视作单一数量单位的数字表达式
One of a pair of marks, [ ], used to enclose written or printed material or to indicate a mathematical expression considered in some sense a single quantity. -
一种常数、变量、函数名或表达式。
A constant, variable, function name, or expression. -
被除数被另一个数除的表达式；被除数
An expression to be divided by another; a dividend.
