One pupil complained in a composition that his father always left so much smoke in the living room that he couldn't do his homework there.
一个学生在一篇作文中抱怨说，他的父亲总是在客厅里留下很多烟雾，以致于他无法在那里做作业。
2
Composition and irradiation crosslinking products processing technology of low smoke, halogen free, flame retardant and low temperature heat shrinkable polyethylene were studied.
研究了低烟无卤阻燃低温收缩聚烯烃材料的配方及其产品辐射加工工艺。
3
Describes the composition and running modes of the smoke control and exhaust system, including the fire ventilation system at stations and in the tunnel, and the fire alarm and device control system.