1. a square matrix of n rows and columns; cells contain n different symbols so arranged that no symbol occurs more than once in any row or column. 
   由n组行列组成的正方形矩阵；包含n个不同符号且每个符号都在任何一行和一列中只出现一次的单元格。
2. a square matrix of n rows and columns; the first n-squared integers are arranged in the cells of the matrix is such a way that the sum of any row or column or diagonal is the same. 
   由n组行列组成的正方形矩阵；将第一个n次方的整数放于矩阵的某个方格中，使任一行列或任一对角线上的元素之和都相等。
3. matrix type of organization 
   矩阵型组织
4. transform a matrix to a diagonal matrix. 
   把一个对角矩阵转化成对角矩阵。
5. cytoplasmic matrix,cytoplasmic ground substance 
   细胞质基质

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