tier
[tɪr]
n.
等级;
阶梯座位等的一排，一行，一层;
包扎工;
vt.
层层排列，使层叠;
vi.
成递升排列，层叠;
例句:
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You said Rangers could not plummet to the lowest tier.
来自BBC
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We sat in the upper tier at the stadium.
我们坐在体育场的上排.
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The father said, " Open it, girl , " but tier hands did not move.
父亲说: “ 女儿, 打开看看. ” 但是,她那双手却一动也不动.
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Each tier of cells is earmarked for a particular function.
每层细胞都有明确的特殊功能标记.
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Yes, but you're a top-tier student athlete.
来自NEWYORKER
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Previously, the department proposed a three-tier system.
来自WSJ