lexical variable

基本解释

Similarly, after package B, $x=20 modifies the lexical variable, and not any of the package variables.
類似的，在package B後，$x=20脩改了詞法變量，而不是任何包變量。
Functions can refer to any variable in their lexical scope (the nested braces surrounding the function's definition), such as the local variables of a function that defines them.
函數可以引用詞法作用域（包圍函數定義的嵌套括號）內的任何變量，例如本地變量（由函數定義）。
It doesn't see the AAA because the variable with that value is a lexical variable, and only exists inside of A.
它不會見到AAA值，因爲那個變量是個詞法變量，僅僅存在於A裡。