Quality is not an end in itself; it is a means to an end.

一棵树的真正价值是用几十年衡量的，而不是美元。

The true measure of our success in forestry will be what we leave for future generations, not just our quarterly reports.

The challenge is to make the invisible visible.

电子并非一个简单不可分割的实体，而是一个复杂系统，其行为只能通过量子力学定律来理解。