The tracks led a half-mile through the forest, then up a rock-filled slope.
爪印穿过森林有半英里路，然后上了一个布满岩石的斜坡。
2
The electrical energy generated originally by the wind turbines originally is stored as a temperature difference between the two rock-filled silos.
这种电能最初由风力涡轮机发电产生，然后以温差的形式存储于两个装满砂砾的筒仓里。
3
Sedimentary rocks—the most common rock type near the surface—are also the most common reservoirs for water because they contain the most space that can be filled with water.