extension ladder

例句：

1. 1. We used the extension ladder to reach the top of the tall tree.
   我们用延伸梯爬到了那棵大树的顶端。
2. 2. The engineer extended the ladder to help the workers climb up.
   工程师把梯子拉长以帮助工人爬上去。
3. 3. The extension ladder is perfect for reaching high places that are otherwise out of reach.
   这个延伸梯非常适合到达那些其他工具无法触及的地方。