Certification schemes are the floor, not the ceiling of responsible forestry practice.
我们都是我们选择的总和,有时也是他人选择的总和。
The possibilities are numerous once we decide to act and not react.
A mathematician's work is mostly a solitary pursuit, but it builds on the work of many others.
只有通过观察自己的行为,你才能发现自己真正相信什么(而不是你认为自己相信什么)。在此之前,你根本不知道自己相信什么。你太复杂了,无法理解自己。
数学中的每个问题都有解决方案;你只需要找到正确的路径。