现在就到人行天桥上大声练英语！
钢结构人行天桥是一种特殊的结构形式。
The steel pedestrian overcrossing is a kind of special structure.
这个人行天桥同时也作为紧急情况下的逃生路线。
This footbridge also functions as an escape route in the event of an emergency.
这个人行天桥同时也作为紧急情况下的逃生路线。
This footbridge also functions as an escape route in the event of an emergency.
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