当我完成我的工作后，我想在这里再呆三个月。
When I finish my work, I want to stay here for another three months.
当我的三个兄弟都睡着的时候，我就会悄悄地从床上爬起去客厅。
I would crawl out of bed and walk quietly down the hallway, while my three brothers slept.
当我们讨论这三个例子的时候，请注意roi是一个拥有两个可变因素的等式。
As we walk through these examples, notice that ROI is an equation with two variables.
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