量子力学的本质在于它提供了一个数学框架,用于描述原子和亚原子粒子的行为。
二叠纪盆地将在未来几十年内保持美国石油生产的皇冠地位。
Sometimes the hardest person to forgive is yourself.
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors."