a rigid metal girder的用法和样例：
- She wore a rigid metal backboard under the back lacing, this was held close to her neck by a wide German silver collar, that had a chain permanently attached.
- Loading was achieved through a battery of hydraulic jacks acting on a rigid metallic distribution plate.
- rigid metal girder
- A rigid diet will make you slimmer.
- The girl slimmed her figure with a rigid diet.