第二必要條件 necessary condition: 必然條件; 必要條件additional necessary condition: 附加必要條件; 附加的必要條件necessary and sufficient condition: 必要充分條件; 充分必要條件; 充要條件sufficient and necessary condition: 充要條件second boundary condition: 諾伊曼邊界條件下載手機詞典可隨時隨地查詞查翻譯