1
a tier of [noun]
The wedding cake had a tier of flowers.
婚礼蛋糕上有一层花。
层，排
先理解核心含义，再看它在真实句子里的用法。
层，排
one of several layers or levels
The wedding cake had a tier of flowers.
婚礼蛋糕上有一层花。
如多层蛋糕、看台等
打结的人
One who ties (knots, etc.).
一排或一列,尤其是高于或低于另一排或列的
A row or range, especially one at a higher or lower level than another.
用于绑扎的东西
Something that ties.
等级或级别；阶层
A rank or grade; a stratum.
The wedding cake had three tiers, each decorated with fresh flowers.
婚礼蛋糕有三层，每一层都装饰着鲜花。
The company offers three membership tiers: basic, premium, and platinum.
该公司提供三个会员等级：基础、高级和白金。
In medieval Europe, society was structured into distinct social tiers.
在中世纪的欧洲，社会被划分为不同的社会阶层。
The wedding cake had a tier of flowers.
婚礼蛋糕上有一层花。
The stadium has three tiers of seats.
体育场有三层座位。
The seats are arranged in tiers.
座位是分层排列的。
Not this
This cake has three tires.
Use this
This cake has three tiers.
误将 'tier'（层）写作同音词 'tire'（轮胎）。注意拼写区别。
Not this
The seating is divided into three tier.
Use this
The seating is divided into three tiers.
可数名词 'tier' 在表示多个层级时需要加复数形式 '-s'。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
顶级，最高等级
The university belongs to the top tier of research institutions.
这所大学属于研究机构中的顶级行列。
较低等级，下层
Companies in the lower tier often struggle to attract top talent.
较低等级的公司往往难以吸引顶尖人才。
第一等级，一流
Only first-tier cities like Beijing and Shanghai have such advanced infrastructure.
只有像北京和上海这样的一线城市才有如此先进的基础设施。
一排（座位/层）
The theater has a tier of boxes overlooking the stage.
剧院有一排俯瞰舞台的包厢。
多层，多个等级
The project has multiple tiers of approval.
该项目有多层审批。
收入等级
Tax rates vary according to income tier.
税率根据收入等级而变化。
Use tier naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
tier 音似“梯儿”，想象梯子的一层一层，就是“层、等级”
通常为中性语域，多用于商业、学术、科技等正式或分类场景，表示等级或层次。
可数名词，常与in或of连用
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.