在每一所大学，选择购买 iPhone 的学生必须支付手机服务费。

At each college, the students who choose to get an iPhone must pay for mobile phone service.

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引擎会为每一层(DAO、服务以及Web)生成包。

The engine generates packages for each layer (DAO, service, and Web).

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如果服务器之间的时间相差甚远，那么需要调整每一台服务器，使时间同步。

If times are too far apart among your servers, you need to go to each server and synchronize them.

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