plain

n.平原，旷野 a.明白的；朴素的

place-kick, place-mat, place-name, place-setting, placebo, placement, placenta, placental, placid, placidity, placidly, placket, plagiarism, plagiarist, plagiarize, plagiarize, plagiarise, plague, plague-ridden (also `plague-stricken), plaice, plaid, plain clothes (esp of police officers), plain dealing, plain flour, plain-clothes man, plain-spoken, plainchant, plainly, plainness, plains, plainsman, plaint, plaintiff, plaintive, plaintively, plaintiveness, plait, plan, plane, plane geometry, plane sailing,