improvementn.改进;改善
improvement expenses[经] 改良(造)费用
improvement thinning抚育性疏伐
Improvement of Sheep绵羊改良
improvement of delay时延改善
improvement district改建区域
improvement research[经] 改进研究, 革新研究
improvement measures改进措施
improvement of bombs炸药改良
improvement of terms条件改善
Improvement of stove改良炉灶