external tank-type heater

例句：

1. 1. The company's headquarters are located in the city center.
   公司的总部位于市中心。
2. 2. The outer wall of the building is made of brick.
   这座建筑的外墙由砖砌成。
3. 3.The car was parked outside the gate.
   这辆车停在了大门外面。