signed tree

例句：

1. 1.The signed tree is a symbol of the forest's protection.
   签字树是森林保护的象征。
2. 2.The local government has signed a new agreement with the neighboring country.
   当地政府与邻国签署了一项新协议。
3. 3. The sign on the tree indicates that it is a protected species.
   树上的标志表明它是一种受保护的物种。