precursor

n. 先驱者,前导,先进者

precipice, precipitant, precipitate, precipitately, precipitation, precipitous, precipitously, precis, precise, precisely, preciseness, precision, preclude, preclusion, precocious, precociously, precociousness, precocity, precognition, preconceived, preconception, precursory, predator, predatory, predecease, predecessor, predestination, predestine, predetermination, predetermine, predetermined, predicament, predicate, predicative, predicative adjective, predicatively, predict, predictability, predictable, predictably, prediction,