preparatory

a.准备性的，预备性

premeditate, premeditated, premeditation, premenstrual tension, premier, premiere, premise, premise (also premiss), premises, premium, Premium Bond, premonition, premonitory, preoccupation, preoccupied, preoccupy, prep, prep school, preparation, preparation for, prepare, prepared, preparedness, prepay, prepayment, preponderance, preponderant, preponderate, preposition, prepositional, prepositional phrase, prepossessing, preposterous, preposterously, prerequisite, prerequisite (also pre-condition), prerogative, Pres, presage, Presbyterian,