n. large outdoor signboard
n. 广告牌, 布告板
vt. 宣传
1. The new movie is advertised on a large billboard in the city.
这部新电影在城市的大广告牌上宣传。
2. I saw a colorful billboard for a concert while driving.
我开车时看到了一个五彩缤纷的音乐会广告牌。
3. Billboards are often used to promote products and services.
广告牌通常用于推广产品和服务。