Given two binary trees, write a function to check if they are equal or not.
题目大意：给定两个二叉树，判断两者是否是相同的二叉树。即结构相同且对应节点的值也相同。
This is not to say that anyone can literally became anything, or that we're equal in our potential.
这并不是说，任何人都能成为超人，也不是说每个人的潜能都是相等的。
All the nations should be equal, whether they are strong or not.
所有国家都应平等，不管它们是否强大。
That does not mean equal in abilities or status.
这并不是指能力或地位的平等。
Admit it or not, this is definitely not something equal.
不管你承不承认，这个肯定不是平等。
She must stand beside me not behind me or in front of me, she will be my equal.
她一定要站在我旁边，而不是前面或者后面。
She must stand beside me not behind me or in front of me, she will be my equal.
她一定要站在我旁边，而不是前面或者后面。
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