gradual d激光二极管的逐渐退化gradualadj.逐渐的；逐步的；平缓的Gradually changeable渐变性gradually flattening分级平坦化gradual approximation渐次近似法gradual stabilization渐近稳定gradually ran to seed逐渐衰弱gradual dose schedule剂量递增表gradual case analysis渐次分析法gradual extermination渐剿gradual cooling curve步冷曲线gradually varied flow缓变流