...itial-expression;] [condition;] [increment-expression]) { statements } for语句首先计算初始化表达式（initial-expression），典型情况下用于初始化 计数器变量，该表达式可选用var关键字声明新变量。
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initial expression 初始表式
initial expression indicator [计] 初始表达式指示符
initial reaction expression 最初的反应表情
initial function expression 初始函数表达式
After the initial expression of hospitality, the delivery man stated his business: he was looking for a wife.
在最初的热情之后，这个送货员摆明了他的交易：他在寻找一位妻子。
The equal sign and the expression giving the initial value are in fact optional in a variable declaration.
等号和表达式给出的初始值在变量声明时实际上是可选的。
Trying new tools or techniques, after initial frustration, can lead to great discoveries and open new ways of self-expression.
尽管在尝试新工具和技术的初期我们有会一些挫折和沮丧，但我们会得到意外的发现和表达自我的新方式。
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