由于过度开采木材资源，所罗门群岛、萨摩亚和汤加的森林退化率很高。
The Solomon Islands, Samoa and Tonga are among countries with high rates of forest degradation due to heavy exploitation of timber resources.
而大洋洲的森林退化率之所以会上升，主要是因为旱灾和火灾，而不是大量的伐木。
It was seen on all continents apart from Oceania and forest-free antarctica-and the increased loss of forest in Oceania was caused largely by drought and fire, rather than by extra logging.
采用强度退化率和应变能损失率为损伤指标，对不同腐蚀程度混凝土力学性能的退化进行分析。
The strength degradation ratio and strain energy loss were selected as damage indexes to analyze the deterioration law of the mechanical properties of concrete in different co.
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