half round countersunk head bolt

例句：

1. 1.The engineer used a half round countersunk head bolt to secure the wooden beam.
   工程师使用半圆沉头螺栓来固定木梁。
2. 2. The construction crew installed the half round countersunk head bolts before starting the project.
   施工队在开始项目之前安装了半圆沉头螺栓。
3. 3.The carpenter used a half round countersunk head bolt to fasten the wooden door.
   木匠使用半圆沉头螺栓将木制门固定住。