APOPO has used specially trained rats on leashes to clear more than 13,200 unexploded bombs from minefields in Tanzania, Mozambique, Angola and Cambodia, according to the National Geographic.

根据美国国家地理杂志表示，该组织利用受过专门训练并系上皮带的老鼠在坦桑尼亚、莫桑比克、安哥拉以及柬埔寨的雷区清理了超过13200枚未爆炸的炸弹。

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Investigators say the bombers had checked in to the Marriott on Wednesday and assembled the bombs in a room on the 18th floor, where an unexploded device was found after the blasts.

调查人员称，袭击者周三入住万豪酒店，并在18楼的一个房间组装了炸弹，爆炸后在此房间还发现了一颗未引爆的炸弹。

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It may seem surprising that unexploded bombs remain undiscovered in Berlin and other German cities decades after World War II ended.

CNN: Experts defuse unexploded WWII bomb in central Berlin

Many unexploded bombs dropped by Allied forces during World War II remain undiscovered in Berlin and other cities some seven decades later.

CNN: Experts defuse unexploded WWII bomb in central Berlin

But in one of the driest Novembers on record, Rhine River levels have dropped dramatically, revealing an unusually large trove of unexploded bombs in its bed.

WSJ: German City to Evacuate as 2-Ton Bomb Is Defused