This is less desirable as the method above, because creating the interface does let you refactor your code to make it cleaner.

与上面的方法一样，这一点不太令人满意，因为创建接口的确能够再分解代码使其变得更加清楚。

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For the moment, facilities that gasify coal to make it cleaner are not widely in operation, and in spite of the many permits being sought by utilities to build nuclear plants (if they wish to do so), no one has come forth with a proposal to actually build one.

FORBES: Greener Days Ahead?

But we still want to make it a cleaner, greener, richer place while using the least amount of human labour possible to do so.

FORBES: Bill Clinton Fails the Green Jobs Test

First, not only is distributed generation cleaner and more efficient, but to make it work requires elaborate electronic-control systems that will result in the commercialisation of the electronic home and business.

ECONOMIST: Letters