half round iron-bar

例句：

1. 1.The half round iron-bar was usedto support the roof.
   半圆铁棒用来支撑屋顶。
2. 2. The half round iron-barwas used as a decorative element in thegarden.
   半圆铁棒作为花园的装饰元素。
3. 3. The half round iron-bar wasused to reinforce the wall.
   半圆铁棒用来加固墙壁。