If one of the required values is None, this means that one of the command line option was not specified.

如果必需的值之一是None，就意味着没有指定一个命令行选项。

youdao

Before Greece descended into crisis, its lorry drivers required special licences, and none had been granted for several decades.

在希腊坠入危机之前，该国的货车司机需要特殊执照，而几十年来没有授予过一张执照。

youdao

A rope would have been required; jean Valjean had none.

非得有一根绳子不可，冉阿让却没有带。

youdao

None is required to have any investment experience, although I understand one does at this time.

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Sadaane had five reserve players on standby, but none is required to make the trip.

BBC: World Cup 2010: Sadaane confirms Algerian squad

None were required to inform their customers of the vulnerability or even of recorded attacks.

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