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put [drink] on a coaster
coaster 指放在杯子或瓶子底下、用来防止桌面被弄湿或损坏的杯垫。
He put his soda on a coaster before sitting down.
他在坐下之前把汽水放在杯垫上。
杯垫；杯托
先理解核心含义，再看它在真实句子里的用法。
杯垫；杯托
a mat that protects a table surface from a cold glass or bottle
He put his soda on a coaster before sitting down.
他在坐下之前把汽水放在杯垫上。
来自或居住于沿海地区的人。
A person who originates from or inhabits a coastal area.
动词coast的施动者名词:滑行的人。
Agent noun of coast: one who coasts.
只在沿海水域航行的水手(尤指船长或领航员)。
A sailor (especially the master or pilot of a vessel) who travels only in coastal waters.
滑行之物或用于滑行的东西。
Something that coasts or is used to coast.
Please use a coaster under your glass so you don't leave a ring on the table.
请在你的杯子下面放一个杯垫，以免在桌子上留下印痕。
She bought a set of coasters decorated with colorful flowers for her new apartment.
她为新公寓买了一套带有彩色花朵图案的杯垫。
The mug was so cold that water dripped onto the wooden table, so I quickly slid a coaster underneath it.
马克杯太凉了，水滴到木头桌上，所以我迅速把一个杯垫滑到它下面。
coaster 指放在杯子或瓶子底下、用来防止桌面被弄湿或损坏的杯垫。
He put his soda on a coaster before sitting down.
他在坐下之前把汽水放在杯垫上。
这是常见提醒语，意思是“请（在杯子下面）放一个杯垫”。
Please use a coaster to protect the table.
请用杯垫保护桌子。
介词 under 表示杯垫在杯子的下方；也可以说 a glass on a coaster，但视角相反。
There was a coaster under each glass.
每个杯子下面都有一个杯垫。
Not this
I need coaster for my cup.
Use this
I need a coaster for my cup.
coaster 是可数名词，单数形式前需要限定词（如 a、the、my）。这里第一次提到一个杯垫，要用 a coaster，不能省略冠词。
Not this
Please coaster the glass before you put it down.
Use this
Please put a coaster under the glass before you put it down.
coaster 只作名词，表示“杯垫、垫子”，不能当动词使用。表达“用杯垫垫着”要用动词 put + a coaster + under...，而不是把 coaster 直接当动词用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
饮料杯垫
Could you pass me a drink coaster for my soda?
你把一个饮料杯垫递给我放汽水好吗？
杯垫套装
The hotel gave every guest a coaster set as a gift.
这家旅馆送给每位客人一套杯垫作为礼物。
酒瓶垫
Use a bottle coaster under the wine bottle at dinner.
晚餐时在酒瓶下面放一个酒瓶垫。
杯垫架
She bought a ceramic coaster holder to match the coasters.
她买了一个陶瓷杯垫架，以搭配这些杯垫。
使用杯垫
The table is easily scratched, so please use a coaster.
桌面容易刮花，所以请使用杯垫。
大起大落；剧烈变化
Life has been a roller coaster this year.
今年的人生真是大起大落。
生活就像过山车，只管去坐就好。
This lyric is from Ronan Keating's 1999 hit song 'Life Is a Rollercoaster', often used to encourage people to accept life's ups and downs.
这句歌词出自罗南·基廷1999年的热门歌曲《Life Is a Rollercoaster》，常用以鼓励人们接受人生中的起起落落。
朋友，我坐的过山车只会向上冲。
This is a line by Augustus Waters in John Green's 2012 novel 'The Fault in Our Stars' and its 2014 film adaptation, showing his optimistic attitude toward his cancer.
这是约翰·格林2012年小说《星运里的错》及其2014年改编电影中奥古斯都·沃特斯的台词，展现了他对癌症乐观的态度。
Use coaster naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
coaster 拆成 coast(海岸)+er；冷杯放上杯垫，水珠像海岸线沿边流，所以杯垫也是 coaster。
语域：neutral 常见场景：咖啡馆、餐厅、家庭餐桌 杯垫/杯托这个义项是日常用语，通常出现在家庭、咖啡馆或餐厅等场景中；正式文体中不常见。沿海航行者等义项则较为正式或专业，学习时可根据语境选择。
这些词与 coaster 押韵：poster, toaster, roaster, boaster（重读元音及后续音一致）。注意 foster 拼写相似但读音不同：/ˈfɒstə/。
Dictionary facts from ECDICT, WIKTIONARY.