植物学家R博士,在自家院子里盖起塑料大棚栽培稀有花草。可是在一个晴朗的冬日中午,大棚发生了火灾,所有花草付之一炬。然而奇怪的是,大家在塑料大棚里并没有找到火源,也没有故意放火的迹象。大棚外面的地面因昨晚下过一场雨湿漉漉的,所以如果有人来此纵火,照理会留下足迹的。可周围没发现任何足迹。R博士找不出起火原因,便请阿酷侦探出马查个究竟。 Botanist Dr. R, in his own yard, built a plastic greenhouse to cultivate rare flowers. However, at noon on a sunny winter day, a fire broke out in the greenhouse and all the flowers were torched. However, strangely enough, everyone did not find a source of fire in the plastic shed and there were no signs of deliberately setting fire to it. The ground outside the greenhouse was wet and rainy last night, so if anyone comes to this arson, he will leave behind a trail. No footprints can be found around. Dr. R could not find out the cause of the fire, he asked Ah cool detective to find out.