以下为句子列表：
英文: A coat of primer should be made over the bare surface before the main painting.
中文: 在喷涂主漆前，应在物品的表面刷一层底漆。
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英文: Abstract: Because of hard ground surface characters of big bulk densities, bare surface and be disturbed easily,the hard ground surface has its laws about sediment yield.
中文: 文摘:硬地面由于具有容重大、地表完全裸露、易受人为干扰等特性，因而其产沙特性有其自身的规律。
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