Forcing the dependencies on interfaces allows you to provide a variety of implementation classes that implement the interface's contract.

强制对接口进行依赖，可以提供各种实现了接口的合约的实现类。

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Serious damage to the global environment, forcing national legislators to take a variety of legal protection measures to limit further deterioration of the environment.

全球环境的严重破坏，迫使各国的立法者不得不采取各种法律保护措施来限制环境的进一步恶化。

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