The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

化学是一门研究物质性质及其变化的科学。

我现在身体上已经无法做任何过去喜欢的事，但我并不怀念它们。

The study of computational complexity is a journey through the landscape of mathematical logic and algorithmic theory.

可以说，消化道是生命物质最初和最古老的实验室。