This makes for an interesting lesson learned: it's easier to piggyback off a pre-existing community with offline behaviors that drive online service usage.
我们从中可以学到的经验是：在已存在的实体社区基础上，对非在线业务提供实用的在线服务更容易。
The second, known as piggyback, doesn't create any connections to the server. Instead, it waits until another DWR service call occurs and piggybacks pending events onto this request's response.
第二种称为piggyback，这种机制并不创建任何到服务器的连接，相反，将一直等待直至发生另一个DWR服务，piggybacks使事件等待该请求的响应。
Four, companies can piggyback off established sales and after-sales service networks such as Haier's.
第四，企业可以学习已经取得成功的企业的销售及售后服务网。海尔旗下的特许经营商，日日顺电器超市，已达6000家。
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