At the same time herds cause wide-scale land degradation, with about 20 percent of pastures considered as degraded through overgrazing, compaction and erosion.
畜群同时造成大范围土地退化，其中20%的牧场因过度放牧、土壤板结和侵蚀而退化。
Both degree of compaction and percent air voids designed in bituminous mixtures have key influence on compaction.
压实度和沥青混合料设计空隙率都对路面的压实起着重要的作用。
Both degree of compaction and percent air voids designed in bituminous mixtures have key influence on compaction.
压实度和沥青混合料设计空隙率都对路面的压实起着重要的作用。
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