好消息是，这个世界充满了经过验证的、廉价的节能方法。

The good news is that the world is full of proven, cheap ways to save energy.

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提倡学前班的人坚持认为，这是经过验证的，并且如果能与孩子的其他教育结合起来，就会取得成功。

Pre-K advocates insist it is proven and will succeed if integrated with the rest of the child's schooling.

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它是一种经过验证的编程语言。

It's a proven programming language.

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