研究显示，表土的管理和地面覆盖材料绝对影响鼠尾草种苗的建立。
Research has shown that topsoil management and mulching positively influences sagebrush seedling establishment.
操场大多采用自然材料建造，景观设计也覆盖了所有的锻炼和游戏区域。 它们都采用橡胶地面或草地。
The playground is designed to use as much natural materials as possible, and the landscape is meant to cover all areas of physical activity and play.
城市地下库中的气体元素(如氡)能透过地面迁移、扩散到地上环境中，不同的地表覆盖材料会有不同的透气性。
Gaseous elements in urban underground can transfer or spread to the surface of the ground, and different surface has different capability of ventilation due to its covering material.
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