对于丢失了的响应需要某种旧数据的过期机制。
Some mechanism of expiring old data may be required for lost responses.
这种方法唯一的缺点是：有获得旧数据的轻微的风险。
The only drawback to this approach is the slight risk of getting stale data.
除了通讯录，我可能还需要处理议程、电子表格、目录信息以及其它旧数据。
In addition to the address book, I may need to process agendas, spreadsheets, cataloging information, and other legacy data.
应用推荐