人心难测，表面友善的人，内心未必真诚。
Innovation in mining technology is essential to meet the world's energy demands.
不忘初心，方得始终，我们要始终牢记"我为祖国献石油"的使命。
我是个物质女孩，生活在一个物质世界。
The beauty of the olfactory system is that it is both simple and complex, allowing us to detect and discriminate an almost infinite number of odors.
The essence of strategy is in the activities – choosing to perform activities differently or to perform different activities than rivals.