When surface cover of natural grassland reaches 90%, the benefits for grass reducingsurface runoff is above 90% and not any erosion occurs.
当草地地面覆盖达90%时，草被拦蓄径流效益达90%以上，而基本上无侵蚀发生。
2
The successful concrete construction and quality control provides guarantees on reducingsurface cavitation and increasing abrasion-resistance capacity.
泄洪洞抗冲耐磨混凝土施工及质量控制的成功，为减小泄洪洞过流面空蚀和抗冲耐磨提供了保障。
3
By the interaction of the amphoteric surfactants AHDHPB-12 with anionic surfactants (AS), the efficiency and the ability of reducingsurface tension were investigated.