Let's say we have a function for calculating the total cost of an order, so we still call that calculate, underline cost, so when calling this function, you need to supply three pieces of information.
假设我们有一个计算订单总成本的
数,所以我们仍然调用那个calculate, underline cost,所以调用这个
数时, 你需要提供三个信息。