| 单词 | tier |
| 释义 | tier (once / 1239 pages) 1n 2n 3n A tier is a level or a layer. If you sit in the top tier of seats at a concert, you can see the whole stage and most of the audience — but you probably have to climb lots of stairs. A tier can describe a layer of ruffles on a dress, a section of seats in a stadium, or one layer of a fancy cake. You could also talk about a tier in terms of value or position. For example, the most popular, well-known actors might be considered part of the top tier, getting all the best parts. Tier originated from the Old French word tire: rank, sequence, or order. WORD FAMILYtier: tiers+/retie: retied, reties, retying/tie: retie, tied, tier, ties, tying, untie/tying: tyings/untie: untied, untier, unties, untying USAGE EXAMPLESThe first of four state-regulated casinos planned for upstate opened in December in the state’s Southern Tier. Washington Times(Dec 31, 2016) Rangers scrambled back up the four-division league pyramid to the top tier this season. Washington Times(Dec 31, 2016) The top tier is the Ultimate Fighting Championship – generally called the UFC – and it’s a business worth several billion pounds. BBC(Dec 29, 2016) 1 1n one of two or more layers one atop another tier upon tier of huge casks a three- tier wedding cake Hyper bed, layer single thickness of usually some homogeneous substance 2n a relative position or degree of value in a graded group 2Syn|Hypo|Hyper grade, level biosafety level the level of safety from exposure to infectious agents; depends on work practices and safety equipment and facilities A levelthe advanced level of a subject taken in school (usually two years after O level) GCSE, General Certificate of Secondary Education, O levelthe basic level of a subject taken in school college levelthe level of education that college students are assumed to have attained biosafety level 1exposure only to infectious agents that do not ordinarily cause human disease biosafety level 2exposure to infectious agents that can cause disease in humans but whose potential for transmission is limited biosafety level 3exposure to infectious agents that can be transmitted by the respiratory route and which can cause serious infection biosafety level 4exposure to exotic infectious agents that pose a high risk of life-threatening disease and can be transmitted as an aerosol and for which there is no vaccine or therapy rank relative status n any one of two or more competitors who tie one another 3Hyper challenger, competition, competitor, contender, rival the contestant you hope to defeat 1n a worker who ties something Syn|Hyper tier up worker a person who works at a specific occupation 2n something that is used for tying the sail is fastened to the yard with tiers Hyper rope a strong line |
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