例句與造句

1. The term "'Carcinoma "'( from the Greek " karkinos ", or " crab ", and "-oma ", " growth " ) is a type of cancer A carcinoma is a cancer that begins in a tissue that lines the inner or outer surfaces of the body, and that generally arises from cells originating in the endodermal or ectodermal germ layer during embryogenesis.
2. It's difficult to find ectodermal germ layer in a sentence. 用ectodermal germ layer造句挺難的