氧炔焰是常规用途中最热的火焰。
Withstand means not be damaged by somethingand wear and tear means damage as a result of ordinary use.经得住是指不会因某物而损害,磨损是指在平常使用中收到损伤。
The double roofs is designed for the anti seepage, heat insulation and insulation. The roof rainwater can be collected for ordinary use.双层屋顶设计是为了解决平屋面容易渗漏、隔热和保温差及水资源利用问题。