A system structure was designed as five tiers of communication tier, interface tier, model tier, feature description tier, and router description tier.

同时，设计了通信层、接口层、模型层、特征描述层和路由描述层的体系结构，解决了特征级感知和感知通信的问题。

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The 200sq metre master area covers the entire third floor, while the guest space, incorporating five bedrooms, spans the second tier.

面积达200平米的主人套房占据整个第三层甲板，而由五间客卧套房组成的宾客空间占据第二层。

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Most observers think the lower-tier markets will be saturated within five years.

多数观察人士认为，二、三线城市市场将在5年内达到饱和。

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The IRB rankings will determine which seeding band the countries find themselves in, with one-to-four in the rankings forming the top band, five-to-eight the second tier, and nine-to-12 the third.

BBC: England drop to fifth in rankings

And it wants to see the Magpies established in the second tier of English football in four to five years.

BBC: Munto reveals Notts County plans

Paying teachers more upfront while at the same time requiring five years (or more) of teacher training at expensive, top-tier universities represents a huge investment not only from the taxpayer but from education schools and potential teachers as well.

FORBES: NCEE Report Focuses on Teachers as Professionals, New Pay Schemes