plastic rock

例句：

1. 1. The plastic rock was so hard that it could not be carved by tools.
   这种塑料岩石太硬了，无法用工具雕刻。
2. 2. The plastic rock is a popular material for making toys.
   塑料岩石是制作玩具的流行材料。
3. 3. The plastic rock was used to build the bridge over the river.
   塑料岩石被用来建造跨越河流的桥梁。