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。
In an arithmetic left shift, the bits shifted beyond the range of the result data type are discarded, and the bit positions vacated on the right are set to zero.
在算术左移位中，位元移动的范围若超过结果资料型别会予以舍弃，而且右方空出的位元位置会设定成零。
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