Are the constituent parts of an arithmetical expression in w3eval 符号( token )是算术表达式的组成部分;
2.
A language element in the formal description of a computer language , for example , the metavariables in an arithmetical expression are constants , variables , operators , etc 计算机语言的形式描述中的语言元素,如在算术表达式中的元变量是常数、变量、运算符等。