棚室内湿度大，光照弱，光照强度减半；
室内的湿度会随时变化,这对摩擦系数影响很大。
The humidity could change in the room and that could change the friction coefficient.
由于夏季室内气温高、湿度大，人们喜欢露宿。
Because of high summer indoor temperature, humidity, people like to sleep.
由于夏季室内气温高、湿度大，人们喜欢露宿。
Because of high summer indoor temperature, humidity, people like to sleep.
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