光波，无论是以太波还是其他波，在所有情况下都是时间上的周期性过程。

The pursuit of knowledge is a journey without end, where each discovery opens the door to new mysteries.

The best leaders don't create followers; they create more leaders.

The future of furniture manufacturing lies in the balance of tradition and technology.

剑鞘保护剑的锋利，自己却满足於它自己的迟钝。