tiers

n.

等级( tier的名词复数 )；包扎的人；一排高过前面一排的东西；阶梯座位的一排

top tier顶层；高层

1. We sat in the upper tier at the stadium.
   我们坐在体育场的上排。
2. Heated air is forced into the upper tier of ducts.
   加热的气流被送入上面的一排管道。
3. We have introduced an extra tier of administration.
   我们额外增加了一层管理。
4. In order to advance to the next crafting tier a crafter must first train in making each item for that tier.
   为了提升到下一物品制造技艺等级，工匠首先必须为这一等级进行训练，尝试去制作每一个物品。

Fiscal Tiers: The Economics of MultiLevel Government
Tiers of Engagement by Universities in their Region's Development
Links: Web Programming Without Tiers
Links: Web Programming Without Tiers
Tiers in articulatory phonology: Some implications for casual speech
Tiers of ontology and consistency constraints in geographical information systems
Direct observation of tiers in the energy landscape of a chromoprotein: a single-molecule study
Papers in Laboratory Phonology: Tiers in articulatory phonology, with some implications for casual speech
The four tiers of structure in integrally skinned phase inversion membranes and their relevance to the various separation regimes
System for scheduling transmission of indexed and requested database tiers on demand at varying repetition rates