1. Protesters held placards outside the government building.
抗议者在政府大楼外举着标语牌。

2. The students made colorful placards for the school event.
学生们为学校活动制作了彩色海报牌。

3. Volunteers distributed placards to the crowd before the march.
志愿者在游行前向人群分发标语牌。

4. The placards clearly expressed their demands for better conditions.
这些标语牌清楚表达了他们改善条件的诉求。

A: Why are so many people holding placards in the square?
A：为什么这么多人在广场上举着标语牌？

B: They are protesting and expressing their opinions with placards.
B：他们正在抗议，并用标语牌表达自己的观点。

1) 用于游行或抗议活动的手持标语牌

2) 用于公共信息展示的告示牌或海报

3) 用于广告宣传的展示牌或宣传牌

1. 标语牌；海报牌（用于展示信息或表达立场的牌子）

e.g. People held placards during the demonstration.
人们在示威期间举着标语牌。

2. 广告牌；展示牌（用于商业或公共宣传）

e.g. The shop placed placards outside to attract customers.
商店在外面放置了广告牌以吸引顾客。

noun

1. a sign or poster carried in public, especially during a protest or demonstration, to convey a message or opinion.

Synonym: sign, poster, banner