The P versus NP problem is one of the most important unsolved problems in computer science.
Safety and environmental protection are the lifelines of an enterprise and must never be neglected.
成功的真正标准是你为社会进步贡献了多少。
地理带的研究揭示了自然界的统一性,尽管它表面上看起来多样。
图像的力量在于它能够唤起一个超越自身的世界。