stone可数还是不可数
例句：
The stone steps were worn and broken.
这些石头台阶被磨平破裂了。
The stone struck her on the forehead.
石头击中她的额头。
A large stone landed right beside him.
一大块石头正好落在他身旁。
Most of the houses are built of stone.
这些房子多数是用石头建造的。
例句：
The stone steps were worn and broken.
这些石头台阶被磨平破裂了。
The stone struck her on the forehead.
石头击中她的额头。
A large stone landed right beside him.
一大块石头正好落在他身旁。
Most of the houses are built of stone.
这些房子多数是用石头建造的。
