求翻译：Fig 6 shows that zeroes occupy the sub-matrices (1, 2) and (2, 1) of the elastic material matrix that relates plastic strain increments to stress increments. The zeroes in sub-matrix (1, 2) imply that there are no relations between normal strains and shear stresses. However, Example (1) in Fig. 6 shows a dense sand specimen acted upon by a normal stress and a shear stress, as for example in a simple shear test. If the shear stress is increased, then increments in shear strains will result, but observations of real soil indicates that the soil will also dilate such that the specimen height increases.是什么意思？

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