If the rule evaluates to true, it performs an action, which in this case, is giving the customer a discount.
如果规则计算为真，则执行一个动作，在本例中是给予客户折扣。
2
We want to make a big order, but this almost can't be true if you didn't give discount to us.
这次我们想预订一大批货，可是如果你不给我折扣的话，这笔生意几乎没有可能做成。
3
Redd says he found that universities that have sharply increased their tuition discount rates have seen graduation rates fall, and that's true even among highly selective schools.