Each holder class has a constructor from an instance, a default constructor, and has a public instance member (value), which is the typed value.

每个holder类都有一个来自实例的构造函数，一个默认的构造函数，以及一个公有的实例成员value，它是一个有类型的值。

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An instance is a member of a single project and cannot be shared across projects.

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For instance, actor Charlie Sheen was a member of MillionaireMatch for a few months.

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Actors are first nominated by an EFP member group -- for instance, the British Film Council in the UK. An international jury of industry experts then selects 10 actors to be presented as Shooting Stars at the Berlin Film Festival.

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