The sphere is the simplest closed surface.
球面是最简单的闭曲面。
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It is fine.It is a closed surface.
这是一个封闭曲面。
youdao
So, s is actually this whole closed surface here.
那么，S实际上是这个完整的封闭曲面。
It is just a notation to remind us closed surface.
这就是一种提醒我们曲面是封闭的的记号。
In any case, minutes before the market closed media reports began to surface that Wachovia was in talks various potential acquirers, including Citigroup.
FORBES: Magazine Article
Soon after opening, the bypass had to be closed temporarily for resurfacing, when the road surface was damaged by a sudden frost.
BBC: Marking 50 years of UK motorways
Sleau Whallian Road and Bayrauye Road, from St Marks to Ballamodha, are both closed due to "substantial damage caused by excessive surface water".
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