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。
Success is not just about making profits, but about creating sustainable value for all stakeholders.
成功不仅仅是创造利润，而是为所有利益相关者创造可持续的价值。
The quality of a country's institutions is the single most important determinant of its long-term economic performance.