Listing 7 shows the macro definition to define math symbols using these functions.
清单7给出的宏定义使用这些函数定义了算术符号。
The bulk of the Ruby class Calc USES Ruby's metaprogramming features to define functions at run time for all the digit keys and for the math operation keys.
大多数Ruby类Calc使用Ruby的元编程功能，在运行时为所有数字键和数学操作键定义功能。
We define "active" as the follower interacted with the account manager at least once every three months. So, you could do a simple math.
我们定义每三个月至少与账号管理者互动一次的订阅者为 为“活跃”的订阅者。
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