ContactSyncService.sync USES a push-pull approach to synchronization.

sync使用推-拉方法进行同步。

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With the pull approach, achieving total data coherence with high network performance is very difficult.

使用拉取方式，要想达到完整的数据一致性以及很高的网络性能是很困难的。

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With a pull approach, on the other hand, the parser is effectively an iterator for going through the components of a document on demand.

相反，在使用拉方式的情况下，解析器实际上是一个高效的迭代器，可以根据需要对文档中的不同部分进行遍历。

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His approach was harder to pull off: raise the bar, create a zone of privacy, don't fall into the trap of trying to prove a negative.

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With the fob in a pocket or purse, a person can approach a locked vehicle, pull the door handle and open the door or trunk.

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It would have taken months to get the approvals needed to pull names out of the data and approach people, and he was impatient to get started.

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