Some people hold up placards symbolizing freedom.

有些人举起象征自由的标语牌。

I use my smartphone to scan bar codes on the placard.

我用智能手机在海报上扫描条形码。

The monitor placarded the newspaper on the wall.

这位班长把报纸粘贴到墙上。

We'll placard the wall with advertisements.

我们将把广告贴在墙上。

Written on the placard are these words: We want peace.

牌子上写着这样一些字：我们要和平。

A long placard bore the names of all the new recruits.

长长一张布告上写着全部新兵的名字。

A long placard bore the names of all the new recruits.

张布告上写着全部新兵的名字。

Painting is my language, my picket protest, my placard.

绘画就是我的语言，我的抗议，我的标语。