例句與造句

1. The first examples of cementation steel is wootz steel from India ( Craddock 1995 : p276 ), where the crucibles were filled with the good quality wrought iron and carbon in the form of organics such as leaves, wood etc . However, no charcoal was used within the crucible.
2. It's difficult to find cementation steel in a sentence. 用cementation steel造句挺難的