例句與造句

1. The accessory cusp known as the protoconule is present on each of the upper molars when they are unworn . " M . mystacinus " lacks the P4 cusp and the protoconules on the molars, but " M . brandtii " has an even larger cusp on P4.
2. It's difficult to find protoconule in a sentence. 用protoconule造句挺難的