placard
音标：
美音：/ˈplækɑːrd/，英音：/ˈplækɑːd/
听听基本释意：
外刊例句：
If most of “Emergency Neon’s” pieces are simple placards written in neon, “Climate Change” is a multi-act drama.
如果说“紧急霓虹灯”的大部分作品都是用霓虹灯书写的简单标语牌，那么“气候变化”就是一部多幕戏剧。
—Washington Post
The issue spawned fierce debates among the hospitality industry in 2018, and its revival has done the same this year, with campaign placards for and against it alongside those for mayoral or council candidates.
这个问题在 2018 年在酒店业中引发了激烈的辩论，今年它的复兴也是如此，支持和反对它的竞选标语与市长或议会候选人的竞选标语一起出现。
—Washington Times
They held placards saying "We want Peace" and "Kurti, we will not give you our children".
他们举着标语牌，上面写着“我们想要和平”和“Kurti，我们不会把孩子交给你”。
—BBC
基本释意：
noun
a sign posted in a public place as an advertisement
n. 海报，标语牌；招贴
同义词：
bill,card,notice,poster,posting,bill
短释义：
A placard is a sign, especially one that advertises something. You might get a summer job standing on the sidewalk, holding a placard that announces a mattress sale — though it may not be your dream job.
标语牌是一种标志，尤其是用于宣传某物的标志。你可能会得到一份暑期工作，站在人行道上，举着一张宣布床垫促销的标语牌——尽管这可能不是你梦寐以求的工作。
长释义：
A concert poster, a storefront notice, a protest sign carried in a rally — each of these is a type of placard. A placard can be as impermanent as a square of cardboard with a scrawled message, and as official as a permanent plaque marking a historic building. The Old French word plaquier is at the root of placard, and it means "to plaster or to lay flat."
音乐会海报、店面告示、集会上的抗议标语——每一种都是标语牌。标语牌可以像带有潦草信息的方形硬纸板一样短暂，也可以像标记历史建筑的永久牌匾一样正式。古法语单词 plaquier 是 placard 的词根，意思是“抹灰或平放”。
文学例句：
Rubbish and abandoned placards lay in the dirt.
垃圾和废弃的标语牌躺在地上。
—The City Beautiful by Aden Polydoros
Only two hanging on it today: one Catholic, not a priest though, placarded with an upside-down cross, and some other sect I don’t recognize.
今天只有两个挂在上面：一个天主教徒，虽然不是牧师，标有一个倒置的十字架，还有一个我不认识的其他教派。
—The Handmaid’s Tale by Margaret Atwood
He lifted the handicapped placard out of the pocket in the door beside him.
他从身旁门上的口袋里掏出残疾人标语牌。
—Small Steps by Louis Sachar
词源：
placard (n.)late 15c., "formal document authenticated by an affixed seal" (a sense now obsolete), from Old French placquard "official document with a large, flat seal" (14c.), also "plate of armor;" ultimately from Middle Dutch, either from Middle Dutch plackaerd or via the French verb plaquier "to lay on, cover up, plaster over," from Middle Dutch placken "to patch (a garment), to plaster," related to Middle High German placke "patch, stain," German Placken "spot, patch."The meaning "written or printed paper displaying some proclamation or announcement, intended to be posted in a public place to attract attention" is attested in English by 1550s; this sense is in French from 15c. As a verb, "to put placards upon," by 1813.Compare plack, a low-value Scottish coin of 15c.-16c., from Old French plaque, name of a coin, literally "slab, plate, patch, veneer, etc.," from Middle Dutch placke, name of a coin, also "a thin slice."Related entries & more
下面是词源的翻译（机器翻译比较难翻，参考着看）
placard (n.)late 15c.，“由加盖印章认证的正式文件”（现在已经过时了），来自古法语 placquard“带有大而平的印章的官方文件”(14c.)，也称为“盔甲板； “最终来自中古荷兰语，或者来自中古荷兰语 plackaerd 或通过法语动词 plaquier“铺上，掩盖，抹灰”，来自中古荷兰语 placken“修补（衣服），抹灰”，与中古德语 placke 相关“补丁，污渍”，德语 Placken “斑点，补丁”。意思是“显示一些公告或公告的书面或印刷纸，旨在张贴在公共场所以引起注意”在 1550 年代的英语中得到证实；这种意义来自 15c 的法语。作为一个动词，1813 年“将标语牌放在上面”。比较 plack，一种 15c.-16c. 的低价值苏格兰硬币，来自古法语牌匾，硬币的名称，字面意思是“平板、盘子、补丁、单板、等，”来自中古荷兰语 placke，硬币的名称，也称为“薄片”。相关条目及更多
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