Teachers are the most important role models in schools, the most instructive examples, and the most vivid examples for students.
翻译：所以不完全了解用兵的危害，就不能完全了解用兵的好处。
The discovery of topological insulators has opened up a new frontier in condensed matter physics, where the interplay of symmetry and topology leads to novel quantum states of matter.
Afghanistan is the land of my past, the place where I had laughed and cried, but it was no longer my home.
