convex piling

例句：

1. 1. The engineer used a convex piling to reinforce the foundation.
   工程师使用一个凸形桩来加固地基。
2. 2.The construction of the bridge involved the use of convex pilings.
   建造这座桥时使用了凸形桩。
3. 3. The project manager decided to install convex pilings to improve stability.
   项目经理决定安装凸形桩以增强稳定性。