trisulcate

例句：

1. 1. The rope was stretched to itsfull length.
   绳子被拉到了它的全长。
2. 2. Thetree is elongating as it growstaller.
   随着树木长得更高，它正在变长。
3. 3. The carpenter extended thebeam to fit the window frame.
   木匠把横梁延长以适应窗户框架。