行程包括往返机票、两晚的酒店住宿、国家航空航天博物馆和国家地理世界办公室之旅。

Trip includes round-trip air tickets, hotel stay for two nights, and tours of the National Air and Space Museum and the office of National Geographic World.

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例如，要更新雇员对象，就需要更新组成该对象的若干数据库表，这可在一个(而非多个)数据库往返行程中完成。

For example, an update of an employee object that requires updating several database tables that make up the object could be done in a single trip to the database rather than multiple trips.

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每个从网络到数据库服务器的往返行程从性能角度来看是昂贵的。

Each network round trip to the database server is expensive in terms of performance.

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