需救援的地点往往不坚固，且潜藏着危险：碎玻璃，扎出来的钉子，脆弱的地板和楼梯，掉落的电线，泄漏的燃气，破损的下水道和水管。
Rescue sites will often be unstable and hide many dangers: broken glass, protruding nails, weakened floors or stairs, downed electrical wires, escaping gas, broken sewer and water pipes.
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