升降幅度 meaning in Chinese

change of elevation
heave amplitude

The thermometer ranges from 45° to 50° .
温度表的升降幅度是从45度到50度。
Chen said prices are likely to remain high over the next couple of months with little fluctuation as demand from both the chinese market and international investors continues to be high
陈先生说，往后几个月铜价可能继续保持高位，升降幅度很小，因为中国市场的需求量大，国际投资商也继续看好这项投资。
Very precise measurements from a research satellite called icesat identified changes on the surface as lakes underneath the ice filled and drained as much as two cubic kilometers of water during the three - year study
科学家利用一个人造卫星对南极洲的表面进行了3年的精确测量，在这段期间，南极冰层下面的湖水发生升降幅度，水量的增减达两立方公里。