The system of mine ventilation faces much more complicated problems than early period.
矿井通风系统面临的问题比前期更多，更复杂。
Summer watering must be more to put the local to the ventilation.
夏天一定要多喂水，放得地方要通风。
Children, especially two, three years old child was ill, and more prone ventilation in children.
儿童，特别是两岁、三岁的小孩子生了病，就更容易发生小儿抽风。
Children, especially two, three years old child was ill, and more prone ventilation in children.
儿童，特别是两岁、三岁的小孩子生了病，就更容易发生小儿抽风。
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