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（路旁或建筑物側面的）巨幅廣告牌，告示牌
A hoarding is a very large board at the side of a road or on the side of a building, which is used for displaying advertisements and posters.
例句
An advertising hoarding on the platform caught her attention.
站臺上的一幅巨幅廣告牌吸引了她的注意力。