... SN Service Notification 业务通知 SN Shuffle Network 往返网络 SN Subscriber Number 用户号 ...
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然而，大多数请求这个数据的应用程序使用了一定程度的缓存，因为网络往返开销很昂贵。
Most applications that request this data, however, employ some form of caching, as network round-trips are very expensive.
存储过程可以封装多个 SQL 语句，有助于避免网络往返。
Stored procedures can help to avoid network round trips by encapsulating multiple SQL statements.
就是因为这种往返的要求和回应，导致了网络的延迟。
The time taken for this round-trip of request and acknowledgment determines the network's latency.
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