昨天我去找他，又扑空了。

Yesterday I went to see him, but again he wasn't home.

《新英汉大辞典》

研究灰拓扑空间的连通性。

The connectedness of grey topological space is studied.

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首先，考虑拓扑空间的一个性质，比如是。

First, consider a property of topological Spaces, such as being.

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有一种把一个拓扑空间同一个图联系起来的简单的方式。

There is a simple way of associating a topological space with a graph.

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有一种把一个拓扑空间同一个图联系起来的简单的方式。

There is a simple way of associating a topological space with a graph.

youdao