因为楼上抛下的一个烟头，导致楼下空调冷凝水管被烧坏；

Throwing one cigarette end could destroy the cool-condensation pipe of air-conditioner downstairs;

youdao

因为楼上抛下的一个烟头，导致楼下空调冷凝水管被烧坏；

Throwing one cigarette end could destroy the cool-condensation pipe of air-conditioner downstairs;

youdao