solid sprinkler system

例句：

1. 1. The building is made of solid bricks.
   这座建筑是用实心砖砌成的。
2. 2. The car was solidly built and had a smooth ride.
   这辆车结实地建造，驾驶起来很平稳。
3. 3. The solid rock was hard to move.
   坚硬的岩石很难移动。