Where Do Flies Go in the Winter ?
During winter flies will hibernate, sometimes in large groups, in any available dry and warm space such as an attic.
The reason there are so few houseflies in winter is that their eggs will hatch only at temperatures between 24° Centigrade and 35° Centigrade (75° Fahrenheit and 95° Fahrenheit). Meanwhile their numbers steadily diminish owing to insecticides and natural causes. This is a good thing since flies often carry diseases.
冬天苍蝇到哪儿去了？
一到冬季，苍蝇就冬眠。任何可以找到的地方，只要干燥、暖和，比如顶楼，就成了苍蝇，有时是一大群一大群的苍蝇，冬眠之处。
冬天，室内苍蝇之所以很少是因为只有当温度达到摄氏24度至35度（华氏76度至95度）时，蝇卵才能孵化。同时，由于人们使用杀虫剂和一些自然原因，苍蝇的数量在不断减少。这是件好事，因为苍蝇常常携带病菌。
摘自 1000 Questions and Answers
整理：鲁蒙海
编辑：海 新
审核：张 扬
