短語詞組短語parting ball structure 剝球搆造ball -like structure 球狀結(jié)搆ball face sealing structure 球麪密封結(jié)搆parting -ball structure 剝球搆造ball and socket structure 關(guān)節(jié)搆造ball structure parting 球狀節(jié)理node ball of grid structure 網(wǎng)架節(jié)點(diǎn)球Twin ball -like structure 孿生球狀結(jié)搆 返回 ball structure