常見例句雙語例句External thread : Threads on an external surface.外螺紋在外表面上形成的螺紋。The root of the external thread or the crest of the inner thread .大徑指過外螺紋牙頂或內(nèi)螺紋牙底的圓柱面直徑。According to connection method classification (1) threaded connection valves: valve with internal thread or external thread , and pipe thread connection.按連接方法分類（1）螺紋連接閥門：閥體帶有內(nèi)螺紋或外螺紋，與管道螺紋連接。 返回 external thread