物理系统的对称性反映在其能级的简并性上。
智能化开采是煤炭行业高质量发展的关键。
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."
最有趣的艺术是让你思考的艺术。
No arts; no letters; no society; and which is worst of all, continual fear and danger of violent death; and the life of man, solitary, poor, nasty, brutish, and short.