Type extensions, which enable you to extend an existing type easily without the additional overhead work of creating a new derived type.
型别扩充，可让您轻松扩充现有型别，而不需要额外建立新的衍生型别。
Type extensions, which enable you to extend an existing type easily without the additional overhead work of creating a new derived type.
型别扩充，可让您轻松扩充现有型别，而不需要额外建立新的衍生型别。
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