Manufactured concrete masonry blocks have stood the test of time as a core building material for retaining walls.

制造混凝土砌块块经受作为挡土墙核心建筑材料了时间的考验。

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A portion of material taken to represent the lot sample, or the original material, and used in the laboratory as a source of test specimens.

部分材料将作为批样或原始材料，且用于实验用试样的来源。

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And then the material performance was confirmed by a serious test such as low-temperature falling ball impact test and airbag deployment specification test.

并以低温落球试验、气囊展开特性试验对材料选择结果进行了验证，并对以后同类型的设计提供了参考。

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