这种技术利用了显现房屋和其他由泥砖建成的建筑的密度特性，因此可以清晰的显现被松散的泥土覆盖的物体。
The technology was helped by the density of houses and other buildings, made of mud brick so that they showed up somewhat clearly against the looser soil cover.
松散的和液力粘合的混合料。第4部分：实验室参考密度和水含量的测试方法。振动锤。
Unbound and hydraulically bound mixtures - Part 4: test methods for laboratory reference density and water content - Vibrating hammer.
堆积密度是指每单位重量的体积松散倾斜燃料。
Bulk density is defined as the weight per unit volume of loosely tipped fuel.
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