石油的真正成本不仅仅是每桶的价格，还包括环境和社会影响。

我对我们如何展示自己和我们真实身份之间的差距感兴趣。

跨国合作对解决全球粮食问题至关重要。

We must, however, acknowledge, as it seems to me, that man with all his noble qualities still bears in his bodily frame the indelible stamp of his lowly origin.  

Technology alone won't solve our problems—it's how we apply it with ethics and foresight that matters.