基于数据到达的同步指的是，任务的执行是基于特定位置的特定数据到达而触发的。
Data-arrival synchronization implies that a task is triggered based on a particular data arriving at a particular location.
客户端每分钟就会与服务器进行若干次同步，上传通话记录，位置，时间和其他信息。
The client would sync with the server several times per minute, updating the system with call history, location, time, and other information.
数据源是指存储所有需要同步的信息的位置。
The data source is the location where all information which needs to be synchronized is stored.
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