| 摘要 |
Systems and techniques for presenting travel planning information to a user are described. First and second cached travel options are retrieved from a cache that stores travel planning travel options. The first cached result is obtained in response to submitting a travel query to a travel planning system at a first time, and the second cached result is obtained in response to submitting the travel query to a travel planning system at a second, different time. The first, retrieved cached result is compared to the second, retrieved cached result; and a change, if detected, is reported to the user.
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