You have three boxes.

你有三个盒子。

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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。

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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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