果皮和胚乳的致密结构是内部高压形成的重要保证。
The compact structure of the pericarp and endosperm is an important guarantee for the formation of grain internal high pressure.
修改的挡土墙，应该产生一个更好的外观，并形成致密结构。
For the modification of the retaining wall, it should produce a better appearance, and the formation of dense structure.
另外，还要确保最外面的大衣是用致密结构的防水材料制成的。
Also, make sure outerwear is made of water resistant and tightly knit material.
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