1
a placard + [v-ing phrase]
后接现在分词短语作后置定语，说明标语牌上所写内容。
A placard reading 'Save the Whales' was tied to the fence.
一张写着‘拯救鲸鱼’的标语牌被绑在栅栏上。
布告；海报；标语牌
先理解核心含义，再看它在真实句子里的用法。
布告；海报；标语牌
a sign or notice displayed in a public place, especially as an advertisement
A placard reading 'Save the Whales' was tied to the fence.
一张写着‘拯救鲸鱼’的标语牌被绑在栅栏上。
公共场所展示用的公告纸板。
A sheet of paper or cardboard with a written or printed announcement on one side for display in a public place.
公共场所张贴的广告
a sign posted in a public place as an advertisement
壁橱等门的木框和框架。
The woodwork and frame of the door of a closet etc.
The workers held up a placard demanding fair wages.
工人们举起一块要求公平工资的标语牌。
A large placard outside the theater advertised the evening performance.
剧院外的一张大海报为晚场演出做了广告。
She read the placard on the museum wall to learn about the exhibit.
她读了博物馆墙上的说明牌，以了解展览内容。
后接现在分词短语作后置定语，说明标语牌上所写内容。
A placard reading 'Save the Whales' was tied to the fence.
一张写着‘拯救鲸鱼’的标语牌被绑在栅栏上。
动词placard意为“在（某处）贴满标语牌”，直接接地点名词作宾语。
The organizers placarded every entrance.
组织者把每个入口都贴满了标语牌。
被动语态后常用with引出所贴的标语或海报内容。
The hall was placarded with event schedules.
大厅被贴满了活动时间表。
Not this
Please write your name on the placard at your seat.
Use this
Please write your name on the place card at your seat.
placard（布告/标语牌）和 place card（宴会座位上的姓名卡）拼写相近但意思完全不同；此处指座位上的姓名卡，应为 place card。
Not this
I bought a placard of my favorite singer.
Use this
I bought a poster of my favorite singer.
placard 多指贴在公共场所的告示或标语牌，不是印刷的装饰性海报；表达明星海报应用 poster。
Not this
The schedule is on the placard at the entrance.
Use this
The schedule is on the bulletin board at the entrance.
placard 指一张张贴的告示或标语牌，不是用于钉通知的布告板；布告板应说 bulletin board 或 notice board。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
举起标语牌
Protesters held up placards demanding change.
抗议者举起标语牌，要求变革。
张贴海报；张贴布告
They put up placards to advertise the event.
他们张贴海报来宣传这次活动。
阅读布告；看告示
Visitors read the placard before entering the exhibition.
参观者在进入展览前阅读了告示。
在墙上贴海报；用海报贴满墙壁
The activists placarded the walls with protest slogans.
活动人士用抗议标语贴满了墙壁。
Use placard naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把placard拆成pla+card，想象成“place（地点）+card（卡片）”：公共场所贴出的卡片，就是布告、海报、标语牌。
语域：mixed 常见场景：public demonstrations、storefront notices、exhibition signs 指在公共场所张贴或展示的告示、海报或标语牌，语气较正式，比较常见于书面和正式场合；日常口语中更常说 sign 或 poster。
按所给读音，placard 的 -card 不读 /kɑrd/，而读 /kɝd/，其中结尾的 /ɝd/ 与 curd /kɝd/、heard /hɝd/ 相同。拼写相似但读音不同：card /kɑrd/、postcard /ˈpoʊstkɑrd/。开头 plac- 的发音更像 plaque /plæk/。hazard 还说明 -ard 在非重读音节可读 /ɚd/。
Dictionary facts from ECDICT, WIKTIONARY.