artificial ruby造句

例句与造句

1. Although the balls are most often made of metal, they can be made of other materials, or in some specialized cases out of artificial ruby.
2. The pallets are often made of very hard materials such as polished stone ( for example, artificial ruby ), but even so they normally require lubrication.
3. It's difficult to find artificial ruby in a sentence. 用artificial ruby造句挺难的