Most articles are more or less referred to the three-tier structure.

大多数文章中都或多或少的讲到了三层架构。

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The paper designs the modules of system with the three-tier structure of J2EE in strict.

本论文在对各模块设计时严格按照J2EE的三层结构进行设计。

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The three-tier structure contains clearly maintenance and reusability and flexibility is discussed.

说明了三层结构具有较好的灵活性、易维护和可重用性。

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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