If a value clause is not specified, the initial value of the item is undefined.
如果没有指定value子句，则表示没有定义该项的初始值。
Xmns sets the initial size of the nursery to the specified value.
Xmns将托儿所区域的初始大小设置为指定的值。
A variable that has an initial value. An initial value may be specified when defining a variable. Variables usually should be initialized.
含有初始值的变量。当定义变量时，可指定初始值。变量通常要初始化。
A variable that has an initial value. An initial value may be specified when defining a variable. Variables usually should be initialized.
含有初始值的变量。当定义变量时，可指定初始值。变量通常要初始化。
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