Sulfate and foils are the best board stocks to be used when embossing packaging materials.
硫酸和箔板压花包装材料时要使用最好的股票。
The high level underground water causes damages on the concrete board of the canal such as seep, freezing, sulfate erosion and swelling by swelled ground.
由于地下水位高，造成地下水对渠道混凝土板的渗透破坏、冻胀破坏、硫酸盐侵蚀破坏和膨胀土膨胀破坏。
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