MySQL has a feature called the query cache that stores the result of a query in memory, should it be needed again.

MySQL 有一个特性称为查询缓存，它将（后面会用到的）查询结果保存在内存中。

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A purchaser could even be required to agree to return the piece if it should become needed for scientific purposes.

如果出于科学目的需要该作品，买家甚至可能被要求归还作品。

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It is needed when there should be a specific list of constant values to be used for the simple type defined by the enumeration.

当枚举定义的简单类型使用常数的特殊列表时，就会需要这种类型了。

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While Ford has yet to require any money, the government has agreed to give it financial support, should it be needed.

BBC: Chrysler approaches key deadline

It has, at the same time, said that if Plan B is needed it should be a monetary, not fiscal, stimulus that is deployed primarily, and where fiscal policy is involved at all it should be - as it was for Labour remember in late 2008 - tax cuts that kick in first.

BBC: IMF set out a 'Plan B' for George Osborne

But it has not cleared up the question of quite how much extra capital will be needed, how it should be raised and precisely when.

BBC: How big is the 'material' hole in banks?