intervalen.丘陵间低地intervaln.间隔；休息时间；(数学)区间；(音乐)音程interval of voltage电压区间intervalve coupling管子间耦合Interval H-matrix[医]叶间的interval modulation间隔调制interval power flow区间潮流interval estimation区间概算interval Ball curve区间Ball曲线interval polynomial区间多项式interval evaluation区间估计interval assignment区间分配