往返次数是在语句执行过程中发送给数据服务器的请求数。
Number of round trips is the number of requests issued to the data server during the execution of the statement.
这可以减少为每个传入 WebSphere Portal 请求多次获取相同数据的往返次数。
This may reduce the roundtrips for fetching the same data over and over again for each incoming request to WebSphere Portal.
通过把这些对象缓存在更接近最终用户的边缘服务器上，Akamai可以减少从起源服务器获取静态内容所需的往返次数。
By caching these objects on the edge server closer to the end users, Akamai can reduce the number of round trips to retrieve static content from the origin server.
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