rigid arch bridge with rigid tie and inclined suspenders

例句：

1. 1. The bridge ismade of rigid steel.
   这座桥是用坚硬的钢制成的。
2. 2. The road was so rigidthat it was difficult to drive over.
   这条路太硬了，很难开车过去。
3. 3. Thematerial is very rigid and will not bendeasily.
   这种材料非常坚硬，不容易弯曲。