第2步：调用另一个服务，以确定是否应批准贷款。
Step 2: Invoke another service to determine if the loan should be approved.
对食品与药品管理局来说，在药品得到批准之前确定它们对人体有何种影响非常重要，但又要在安全允许的范围内让程序加快；许多生命依赖于这一程序。
It was important for the FDA to determine how drugs would affect the body before they were approved, but the process should be as speedy as safety permitted; lives were riding on it.
业务规则对订单中的数据进行评估，然后确定订单是可以自动被批准还是需要人工批准。
A business rule evaluates the data from the order form to determine whether the order can be automatically approved or whether it needs human approval.
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