必须要确保，如果做右旋，顶端节点必须有一个左子节点。
You must be sure that, if you're doing a right rotation, the top node has a left child.
换句话说，就是一个有右子节点的节点的可能接左子节点的位置，或者是有左子节点的节点的可能接右子节点位置。
In other words, it's the potential left child of a node with a right child, or the potential right child of a node with a left child. This will make more sense as we go along.
猫狗和人一样也有左、右撇子之分。
Dogs and cats, like humans, are either right or left handed.
原本明显处于优势地位的左邻居竟然一下子被打击得病倒了，而他好不容易组织起来的销售网络也在一瞬间瓦解。
Originally obviously in advantage position left the neighbors have suddenly be on falling ill, and he is very not easy to organize sales network in a collapse.
猫狗和人一样也有左、右撇子之分。
Dogss and cats, like humans, are either right or left handed.
而子节点也是这样一个节点，也有一个左节点和一个右节点，当然也可以没有子节点，也就是说一个节点可能有零个或者两个子节点。
Each child is itself a node, and either or both of the child nodes can be null, meaning that a node may have zero to two children.
我们只不过是在人生的甩子里不断选择，前是六、后是一、左是三、右是二、上是五、下是四。
We just always throughout our life to choice, face six, back one, left three, right two, up five, down four.
小猫小狗跟人类一样，都有左撇(爪)子。
Dogs and cats, like humans, are either right or left handed (paw).
碱泉子—洛包泉活动断裂带总体走向北东东 ，平面上由7条呈左阶斜列状排列的活动断裂组成。
Jianquanzi-Luobaoquan active fault zone, general strike in NEE, is composed of 7 left-stepped, oblique-arranged active faults.
该煎饼底部折叠略有上升(以防止掉出来)，而煎饼是一下子从左至右包裹的内容，在软塔科方式。
The bottom of the pancake is folded up slightly (to prevent the contents from falling out), and the pancake is either folded or wrapped from left to right, in the manner of a soft taco.
该煎饼底部折叠略有上升(以防止掉出来)，而煎饼是一下子从左至右包裹的内容，在软塔科方式。
The bottom of the pancake is folded up slightly (to prevent the contents from falling out), and the pancake is either folded or wrapped from left to right, in the manner of a soft taco.
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