參數

儘管參數的值可變，但我們仍把它視為常量，而非變量。

jǐnguǎn cānshù de zhí kěbiàn dàn wǒmen réng bǎ tā shìwéi chángliàng ér fēi biànliàng

Even though a parameter's value can change, it is treated as a constant, not as a variable.