grindstone with chest

例句：

1. 1. The old man was using hisgrindstone to polish his boots.
   那位老人正在用他的磨石来打磨他的靴子。
2. 2.The stone with a chest is a popularitem in the antique market.
   这个带有胸袋的石头在古董市场上很受欢迎。
3. 3. Hecarefully placed the stone with a chest intothe trunk of his car.
   他小心翼翼地把那个带有胸袋的石头放进了汽车的后备箱里。