象是一门
It seems like a door
以上为机器翻译结果，长、整句建议使用 人工翻译 。
拓扑是一门数学，它研究的对象是物体在平滑变形(例如伸长、挤压、弯曲、但不得切断或连接起来)之下仍会保持不变的性质。
Topology is the mathematical study of properties that are unchanged when an object is smoothly deformed, by actions such as stretching, squashing and bending but not by cutting or joining.
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