第20行的目标函数要对食物的总体成本实现最小化，该值是每个决策变量(食物数量)乘以每单位食物成本的结果。
The objective function on line 20 minimizes the total food cost as the total of each decision variable (amount of food) multiplied by that food's cost per unit.
这些是位置、文本内容和颜色、字体大小、淡入和淡出速度(以毫秒为单位)及保存显示字符串的数组的默认变量。
These are the default variables for the position, text contents, and color, font size, fade-in and fade-out speed in milliseconds, and an array to hold the display string.
比方说，一个关键字可以扩展成菜谱中的重量单位、硬件参考中的部件名称或者编程参考中的变量。
For example, a keyword can be extended as a unit of weight in a recipe, as a part name in a hardware reference, or as a variable in a programming reference.
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