你有三个盒子。
If you have three boxes (or variables), you can refer to a particular one using its name.
如果你有三个盒子（或者说变量），你可以通过名字找到特定的那个。
You have three boxes. One contains only apples, one contains only oranges, and one contains both apples and oranges.
有三个箱子，一个装的全是苹果，一个装的全是桔子，还有一个装的是苹果和桔子。
You have three boxes. One contains only apples, one contains only oranges, and one contains both apples and oranges.
有三个箱子，一个装的全是苹果，一个装的全是桔子，还有一个装的是苹果和桔子。
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