the gravel grave cement and concrete thickness are given for reference only
砾石、水泥、混凝土厚度仅供参考
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The gravel, grave cement and concrete thickness are given for reference only; the final thickness will be accurately calculated according to Chinese regulation.
砂砾层，水泥稳定石层，和混凝土层的厚度仅供参考，最终将根据中国规范精确的测算出其各自厚度。
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