If you find that an extension function can do a better job than a stylesheet function, then you can define the stylesheet function to be the second choice when the extension function is not available.

如果发现扩展函数比样式表函数更好，可以定义样式表函数作为扩展函数不能使用时的第二选择。

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The second choice allows the JSON serialization of known extensions to be optimized and simplified but still limits the usefulness of the serialization.

第二种选择允许对已知扩展的JSON序列化进行优化和简化，但是仍然限制了序列化的效用。

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Wang went on: “If (Americans are) asked to choose to understand a foreign country, first choice would be the European countries, and the South American countries may come second.

王继续说：“如果（美国人）被要求选择去了解一个外国，第一选择会是欧洲国家，许多南美国家作为第二选择。

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We could choose any two quantities, and, in fact, it turns out that these are going to prove, after we have the second law, not to be the best choice.

我们可以任选两个物理量，其实，在学习了热力学第二定律之后，我们可以证明，这样的选择并不是最好的。

麻省理工公开课 - 热力学与动力学课程节选

"I want to be your second choice, " Bush told them, tipping his hand.

CNN: Who chose George?

Some believe the eventual choice is most likely to be a second runway at Stansted, where the airport layout is most practical and where opposition could be least.

BBC: The future of flying

Votes not needed by a candidate, because they have too few to be elected to a post or enough to guarantee a position, are transferred to the voter's second choice.

BBC: BT rolls the dice