Choosing a course to study at university is a decision with many variables.
迭择在大学学习哪些课程是一个有着许多变数的决定。
The choice is a complicated one, with many variables, but it remains a choice.
这一选择相当复杂，有许多因素，但它依然是一种选择。
With so many variables, it is difficult to calculate the cost.
有这么多的可变因素，很难计算出成本。
With so many variables, it is difficult to calculate the cost.
有这么多的可变因素，很难计算出成本。
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