简单地说，如果应付款日期与主机变量中提供的值匹配，它就返回应支付金额。
Put simply, it returns the payable amount if the payment due date matches the one supplied in the host variable.
更简单地说，每个行为都会产生与之相对应且相等的回应。
In more simpler words, to every action there is an equal and opposite reaction.
你还会发现每个线条和每个顶点都有回应，它扩展到别的东西：可能是颜色或纹理的改变，或者是地板上画的简单线条，它们都以另一种姿态与整体相连。
You also find that each line, each vertex has an echo, it expands to something else; a change of color or texture, or a simple line drawn over the floor. Another gesture that connects with the whole.
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