Is it better to re-declare variable in module or reference separate module?

这是更好地重新申报模块或参考单独模块变量？

youdao

You may be wondering, in a problem with many more decision variables and constraints, would you have to declare each variable and each constraint separately?

我们可能会纳闷，在有更多决策变量和约束的问题中，我们只能分别逐一声明每个变量和每个约束吗？

youdao

A manifestly typed language forces you to declare each variable and each function argument.

显式类型语言要求声明每个变量和每个函数参数。

youdao

You don't have to declare a special variable for it if you don't care about its actual value.

你并不需要为它声明一个特定的变量,如果你不关心它的实际值。

哈佛公开课 - 计算机科学课程节选

And when you declare a variable, whether as an argument or as literally a local variable, they only live inside of that function.

当你声明一个变量，不论是一个参数,还是一个局部变量，它们只存在函数的内部。

哈佛公开课 - 计算机科学课程节选

It's a common mistake to make if you forget that I've actually declared that variable up top, but wait a minute, I know any time that I use a variable, I have to declare it.

这是一个通常犯的错误，如果你忘了,之前在前面已经声明了这个变量，等等，我知道在任何时候,我使用一个变量，我必须声明它。

哈佛公开课 - 计算机科学课程节选