[] () a pair of boards with advertisements on them that sb wears at the front and back of their body as they walk around in public三明治式广告牌（挂在胸前和背后的一副广告牌）a wooden frame in two parts, joined at the top, that stands on the ground and has advertisements on each side（两片木质框架，顶端相连，放在地上且两面有广告的） A 型广告牌