Open Flames and welding

• 明火和焊接

Open Flames and welding的用法和样例：

例句

1. They say it cuts the smoke and dangerous gases by up to eighty percent compare to open fires or simple traditional stoves.
   他们说相比明火和简单的传统炉灶，这种炉灶的烟尘和有害气体的排放量下降了百分之八十以上。