By the rules of the mathematical field of topology, two Spaces are considered equivalent if one can be bent, stretched, and perhaps folded until it looks like the other.
根据拓扑学领域的规则，两个空间中，如果一个空间可以弯曲、拉伸，也可能折叠，直到和另一个空间一模一样，这两个空间就可以认为是相等的。
He folded the letter and put it with the other one.
他把信折起来，把它和上封信放在一起。
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