SSL addresses the problem of protecting user data exchanged between tiers in a three-tier system.

在三层系统中，SSL可以解决保护各层之间交换的用户数据的问题。

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A three-tier enterprise architecture consists of a client tier, middle tier, and a data tier.

一个三层的企业架构由客户机层、中间层以及数据层组成。

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The New York Times announced the shocking result in a three-tier, seven-column, front-page headline the next day.

次日，纽约时代周刊以三行七栏的头版头条报道了这一令人震惊的结果。

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Graham Newman, cabinet member for education, said it was a "fact" that pupils educated within a two-tier system outperformed those educated within a three-tier system.

BBC: Suffolk middle school closures continue

Both Delta and US Airways have a three-tier redemption structure, offering seats at the basic level, a midtier level at around 40, 000 miles for a domestic coach ticket and a full-fare level for as many as 60, 000 miles for domestic coach round trips.

WSJ: Frequent-Flier Miles: Best Airlines for Cashing In

The RAC also wants to see the introduction of a three-tier warning system for over-the-counter drugs so drivers know at a glance which drugs pose a driving hazard.

BBC: Tests for drug drivers