所有的用户行为都由servlet处理，它先调用相应的会话bean的适当方法，然后调用适当的JS p页面向用户返回行为结果。

All user actions are handled by servlets that call the appropriate methods on the corresponding session beans, then call the appropriate JSP pages to return the results of the action to the user.

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用户的所有行为都是由servlet处理的，servlet先调用相应会话bean上的适当方法，然后再调用适当的JS p页面向用户返回行为的结果。

All user actions are handled by servlets that call the appropriate methods on the corresponding session beans and then call the appropriate JSP pages to return the results of the action to the user.

youdao

服务公开了一个接口契约，它定义了服务的行为以及接受和返回的消息。

A service exposes an interface contract, which defines the behavior of the service and the messages it accepts and returns.

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