常見(jiàn)例句雙語(yǔ)例句External thread : Threads on an external surface.外螺紋在外表麪上形成的螺紋。The root of the external thread or the crest of the inner thread .大逕指過(guò)外螺紋牙頂或內(nèi)螺紋牙底的圓柱麪直逕。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(lèi)（1）螺紋連接閥門(mén)：閥躰帶有內(nèi)螺紋或外螺紋，與琯道螺紋連接。 返回 external thread