Why not write the program in a way where you figure out dynamically when the program is run how much memory you need rather than hard coding in two with or within that constant.

为什么不写一个可以动态的方式写那个程序,程序可以动态分配内存,而不是用常量硬编码两个值。

哈佛公开课 - 计算机科学课程节选

So it's a useful way of not quite knowing in advance what you want to put in a string, but being able to create strings, phrases, sentences, dynamically.

这是一个很有用的方法，如果你之前不是很了解,在句子中要加入什么，但是这个方法可以,动态地创建字符串，短语，句子。

哈佛公开课 - 计算机科学课程节选

I can just whip out a variable, this time it's gonna be dynamically stored there.

我们可以临时分配一个变量，将这个值暂时存放在这个变量中。

哈佛公开课 - 计算机科学课程节选