improvern.改良者；改善者；改进剂improvevt.改善；改进；提高vi.变得更好；改进improved soil layer地基改良improved earth road粗整面土路Improve adaptability提高适应性improve every moment珍惜每一刻光阴improve a generation提高一代人improved core method改进核心法improved ground rent提价地租improve power factor提高功率因数improve on algorithm算法改进improved SBR process改良SBR工艺