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1. 行人天桥：foot switch 踏脚开关 | footbridge 行人天桥 | footing 基脚;底脚;墙基

2. 人行天桥：fountain and irrigation system喷泉系统 | footbridge人行天桥 | fire truck消防车

3. 步桥：foot-pound-second 英尺-磅-秒 | footbridge 步桥 | footed pile 盘脚桩

1. 人行桥;步行桥
    A footbridge is a narrow bridge for people travelling on foot.

1. a bridge designed for pedestrians

    Synonym: overcrossingpedestrian bridge