单词：direct sum
direct sum的用法和样例：
例句
- First, the method for constructing linear stego-codes is proposed by using the direct sum of vector subspaces.利用线性空间的直和分解得到了一种线性隐写码的构造方法。
- It gets some results about the relation between the direct summands of an additive group and the summands of the endomorphism ring of this additive group.得到了关于加法群的直和项与其自同态环的直和项间相互刻画的一些结论。
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