The ceramic-metal composite materials have the advantages of high hardness, strength, toughness and low density, and are widely used in bulletproof field.
陶瓷-金属复合材料具备高硬度、高强度、高韧性以及低密度的优点，已被广泛应用于防弹领域。
The great task that is before you now, Dear Ones, is the shattering of the band of deeply embedded negative thought forms that have formed as a field of low density energy that surrounds the Earth.
这项伟大的任务现在就在你眼前，亲爱的，正在震碎这帮深深嵌入的负面想法，而它们形成了一个围绕整个地球的稠密低级的能量场。
This paper introduces the properties, working mechanisms and field applications of silicon composite low density cement slurry.
介绍了微硅复合低密度水泥浆的性能、作用机理及现场应用情况。
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