The tunnel is a three-level structure of 12m diameter.

通道是直径为12米的三层结构。

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Based on a three-level structure of WSN, base station and data server, water attainment sampling algorithms by predicate are designed and simulated.

在无线传感器网络、基站和数据服务器三层结构的基础上讨论基于谓词的水质达标采样算法，对算法进行分析、设计和仿真。

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MRP system is not very efficient in production planning and control of job shop, especially of the one that contains three-level structure: shop, subshop and workgroup.

物料需求计划（MRP）系统对于车间层，尤其是基于车间-工段-班组的车间层的作业计划和控制不是很有效的。

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The room sits on the bottom of a three-level floating structure, located 250m from shore in the Indian Ocean.

BBC: An underwater hotel opens in Africa

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