递降[dì jiàng]
词典degradation：恶化；堕落；潦倒；毁坏。
词典decrease gradually：递降。
词典progressive decrease：递降。
词典go down progressively：递降。
递降[dì jiàng]
degradation; decrease gradually; progressive decrease; go down progressively; be reduced by degrees
1. degradation：degeneration 退化 | degradation 递降 | degras 油余物
2. degraded：degrade 瑕疵 瑕疵 递降 | degraded 递降 | degradedalkalisoil 变质碱土