direct fired kiln

例句：

1. 1.The direct fired kiln is an essential tool for the production of ceramics.
   直接烧成的窑是陶瓷生产中不可或缺的工具。
2. 2.The direct fired kiln has a high efficiency and can produce high-quality products.
   直接烧成的窑效率高，能生产出高质量的产品。
3. 3. Direct fired kiln technology has been widely used in the ceramic industry.
   直接烧成的窑技术在陶瓷行业得到了广泛应用。