例句與造句

1. Joseph Davidovits who researched a piece of concrete material that " is made of antique concrete ( not modern ) " and " with artificial pozzolan ( calcined clay ) " concluded that the information published on the project's website are inaccurate, as " is a kind of Roman concrete, which in no way corresponds to the materials that constitute the casing of the pyramids and look like pudding stone ".
2. It's difficult to find artificial pozzolan in a sentence. 用artificial pozzolan造句挺難的