solid substrates

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 is solidly built and has a smooth ride.
   这辆车结实地建造，驾驶起来平稳舒适。
3. 3. The solid rock was formed over millions of years.
   这块坚硬的岩石是在数百万年里形成的。