claim occurrence liability coverage 索赔发生基础责任保险
Vegetation is an indispensable part of terrestrial ecosystem, and the increase of vegetation coverage could effectively slow down the occurrence of soil erosion.
植被是陆地生态系统中不可缺少的一部分，植被覆盖度的增加能够有效减缓土壤侵蚀的发生。
The coverage of BeO on the specimen surface came from the preferential oxidation of beryllium due to the occurrence of residual oxygen in the vacuum system.
氧化铍在表面的覆盖来源于真空中残余氧气在样品表面的化学吸附，从而导致了铍的择优氧化。
The factors that influenced Locustae's occurrence were hydrology conditions, vegetation types and coverage, farming systems, natural enemies and so on.
影响东亚飞蝗发生的环境因子主要有水文条件、植被种类以及植被覆盖度、耕作制度和天敌等因素。
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