coupling/ˈkʌplɪŋ; `kʌplɪŋ/ n1(a) [U] act of joining 连结.(b) [C, U] (arch or rhet 古或修辞) (act of) sexual intercourse 性交; 云雨.2 [C] link connecting two parts, esp two railway carriages or other vehicles 连接器; （尤指列车等的）车钩, 挂钩.
牛津英汉双解词典