three finger rule
美
[θri ˈfɪŋɡɚ rul]
英
[θri: ˈfiŋɡə ru:l]
[电] 三指定则
Examples
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美[θri ˈfɪŋɡɚ rul]英[θri: ˈfiŋɡə ru:l]
[电] 三指定则