The second scenario is based on the first and is used to show how mediation policies can be conditionally applied based on which operation is being called.

第二种场景建立在第一种场景之上，用来演示如何根据所调用的操作应用中介策略。

youdao

The first set of fields are used by the InvocationPatternComp to decide which operation to call and which invocation pattern to use.

InvocationPatternComp 使用第一个字段集来确定调用哪一个操作和使用哪一个调用模式。

youdao

The DocumentRoot instance object is the first retrieved, and is the root node used in the operation logic in Listing 8.

所检索到的第一个对象是DocumentRoot实例对象，此对象在清单8中的操作逻辑中作为根节点使用。

youdao

The team believes that acupuncture was first used in dentistry for pain relief during an operation to remove a patient's tonsils in Shanghai in 1958.

BBC: dentist

The strikes were the largest military operation ever undertaken by Nato, and the first time it had used force against a sovereign state without UN approval.

BBC: Profile: Nato