flat vaulted ceiling

例句：

1. 1. The floor is flat and easy to clean.
   地板是平的，容易清洁。
2. 2. The table is flat enough for a group of people to sit around.
   桌子足够平，可以供一群人围坐。
3. 3. Flatten the pizza before baking it.
   在烘烤之前将比萨饼压平。