冠石

例句：

1. 1. The stone is shaped likea crown on top of the tree.
   这块石头形状像树顶上的王冠。
2. 2. Thestone was found in the riverbed,and it has been used for centuries.
   这块石头被发现在河床上，并且已经被使用了几个世纪了。
3. 3.The stone is said to havehealing properties.
   据说这块石头有治愈性质。