短語詞組短語vector magnetic potential 磁矢勢;矢量磁位vector late potential positive 晚電位陽性vector -potential 矢勢vector r potential field 矢位場vector r potential 矢量勢vector electric potential 矢量電位vector gravitational potential 矢量重力勢electro -magnet vector-potential a 電磁矢勢a 返回 vector potential