You are never too old to set another goal or to dream a new dream.
在原子和电子的世界中,经典物理学的定律不再有效,我们必须转向量子力学以获得正确的描述。
The best way of learning about anything is by doing.
荒野不会奖励最强或最快的人。它会奖励最适应的人。
A ship in port is safe, but that's not what ships are built for.