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.
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 zero parallax is controlled by trimming columns the left of the left image and off the right of the right image, this is described here.
零视差取决于从左侧画面的左边沿到右侧画面的右边沿的裁切列。
On account to cannot be semigroups, so cannot be left (right) zero semigroups absolutely.
因为不能作成半群，故更不可能作成左(右)零半群。
应用推荐