??翻譯

(pen鏃)
[??] 筆尖(兒) bǐjiān(r). 鋼筆頭(兒) gāngbǐtóu(r). 鋼筆尖(兒) gāngbǐjiān(r).
　　■ ??? ???; 換筆尖(兒)