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a flier for [event/product]
flier 与 flyer 为异体拼写；在此义项下两者皆通用。
She handed me a flier for the new restaurant.
她递给我一张新餐厅的广告传单。
传单；广告传单
fliers — plural of flier
先理解核心含义，再看它在真实句子里的用法。
传单；广告传单
a printed advertisement or leaflet intended for wide distribution
She handed me a flier for the new restaurant.
她递给我一张新餐厅的广告传单。
操作飞机的人
someone who operates an aircraft
广泛散发的广告传单
an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
乘飞机旅行的人
someone who travels by air
The flier checked in at the airport two hours before departure.
这位乘客在起飞前两小时在机场办理了登机手续。
As a frequent flier, she has accumulated enough miles for a free ticket.
作为一名常飞旅客，她已经积累了足够兑换一张免费机票的里程。
The flier was nervous during the turbulence, but the pilot reassured everyone.
颠簸期间，这名乘客很紧张，但飞行员安抚了大家。
flier 与 flyer 为异体拼写；在此义项下两者皆通用。
She handed me a flier for the new restaurant.
她递给我一张新餐厅的广告传单。
frequent flier 是固定说法，指经常乘坐飞机出行的人。
As a frequent flier, she has a collection of boarding passes.
作为常飞旅客，她收集了一堆登机牌。
此义项指飞行器操作者，日常口语中 pilot 更常用。
My uncle is a flier of small planes.
我叔叔是小型飞机的驾驶员。
Not this
Please give me flier.
Use this
Please give me a flier.
flier 是可数名词，单数形式前需要加不定冠词，所以应说 a flier；中文里“传单”常不带量词，但英语不能省略冠词。
Not this
There are many flier in the airport.
Use this
There are many fliers in the airport.
flier 的复数形式是 fliers，many 后必须接复数名词，不能因为 flier 以 -er 结尾就漏加 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
常飞旅客；飞行常客
She is a frequent flier on this route.
她经常乘坐这条航线。
飞行里程积分
He used his frequent-flier miles to book a free ticket.
他用飞行里程积分预订了一张免费机票。
散发传单
Volunteers distributed fliers in the neighborhood.
志愿者在附近街区散发传单。
广告传单
The company designed an advertising flier for its new product.
公司为新产品设计了一份广告传单。
经验丰富的飞行员
Only an experienced flier could land in such strong winds.
只有经验丰富的飞行员才能在这样的强风中降落。
印刷传单
The shop printed fliers for the upcoming sale.
这家商店为即将到来的促销活动印刷了传单。
冒险；铤而走险
He took a flier on the new startup and lost everything.
他在新创业公司上冒险，结果赔光了一切。
有抱负且成功的人；出类拔萃者
She's a high flier who became CEO at 30.
她是个出类拔萃的人，30岁就当上了首席执行官。
常飞旅客；飞行常客
As a frequent flier, she gets free upgrades.
作为常飞旅客，她能获得免费升舱。
Use fliers naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
flier 像 fly（飞）加 -er：天上飞的是飞行员，手里飞出去的是传单，坐飞机飞的是旅客。
语域：mixed 常见场景：advertising、aviation、air travel flier 通常为中性词，但具体含义需看搭配：宣传/广告场景多指传单；航空场景多指飞行员或航空旅客；口语与书面语中都较常见。
可数名词，复数形式为 fliers。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.