de·cres·cence英dɪ'kresəns美dɪ'kresənsBNC²³⁶²¹³⁺¹ 基本例句 减少,下降,减退,衰退,减小 For the scouring and depositing equilibrium stream, the dominating factor resulting in gravel decrescence was stroking, weathering and grinding. 对于基本冲淤平衡的河流，卵石沿程细化的主要原因是碰撞破碎、风化和磨损。 fabiao