"I think the most important thing about the house is just how much energy it really does conserve.

VOA: special.2009.10.27

So that they will want to conserve the wilderness." That's what it was about.

这样他们就会想要保护这片荒野。”那就是它的作用。

美国的博物馆教育 - SpeakingMax英语口语达人