短語詞組短語outgoing secondary line switch 出中繼第二級尋線機outgoing g line 引出線outgoing trunk line 出中繼線outgoing only line 出局專線Outgoing line sleeve 出線套direction of outgoing line 出線方向incoming and outgoing line 進出線outgoing line busy indicator 出線忙指示器heating outgoing line corridor 熱力管線走廊 返回 outgoing line