The MEP defines the sequence of messages in the operation and their direction.
mep定义操作中的消息顺序及其方向。
2
A service invocation is almost always a two-way operation, meaning that a request is sent from the consumer to the provider and a response is sent back in the other direction.
服务调用几乎始终是双向操作，这意味着请求是从使用者发送到提供者的，而响应是按照相反的方向返回的。
3
Today, at my direction, the United States launched a targeted operation against that compound in Abbottabad, Pakistan.