Certain useful types, like decimal and string, are built in.

某些有用的类型，如小数的和字符串类型，是内置的。

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This approach is particularly useful for certain types of projects.

此方法尤其适用于某些类型的项目。

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This approach is particularly useful for certain types of projects.

此方法尤其适用于某些类型的项目。

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