酸和碱不是绝对的，而是相对的。

There are things that happen and leave no discernible trace, are not spoken or written of, though it would be very wrong to say that subsequent events go on indifferently, all the same, as though such things had never been.

"Literature has the power to transcend time and space, connecting us to the thoughts and feelings of people from different eras and cultures."

一个组织的客户服务质量决定了其客户忠诚度的质量。

跨行业合作是解决全球能源挑战的关键。