如果创建托管模板类型的变量，也将发生LNK2020，但同时不实例化该类型。
LNK2020 will also occur if you create a variable of a managed template type, but do not also instantiate the type.
如果创建托管模板类型的变量，也将发生LNK2020，但同时不实例化该类型。
LNK2020 will also occur if you create a variable of a managed template type, but do not also instantiate the type.
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