in tiers

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UK 
  • adv.排成一层一层
  • Web呈阶梯式
adv.
1.
排成一层一层

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard