horizontal tubular boiler

例句：

1. 1.The painting is horizontal, so it can be easily hung on the wall.
   这幅画是水平的，所以可以很容易地挂在墙上。
2. 2.The road is horizontal, so it's easy to drive along it.
   这条路是水平的，所以很容易沿着它行驶。
3. 3.The river flows horizontally across the landscape.
   这条河在景观中横向流动。