刻划了一类含左零因子的代数的结构，解决了己有文献提出的问题。
The structures of a kind of algebras which contain left zero-divisors are characterized, and the problem advanced in Wu Pinshan's work ls solved.
我已经将list元素设置为左缩进30px，假如你要顶端对齐，则将缩进像素数归零。
I've also re-indented list items by 30 pixels on the left, so if you want hanging bullets, be sure to set that back to zero.
空树的汇总是零，其他树的汇总是左树加上Integer的值再加上右树的值。
The sum of an empty tree is zero, and the sum of other trees is the sum of the left tree plus the value of the Integer plus the sum of the right tree.
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