The challenge for modern states is to maintain their legitimacy while also being effective in providing services and maintaining order.
我不后悔过去，它造就了今天的我。
我们不是通过经验学习，而是通过对经验的反思学习。
The behavior of the whole cannot be predicted from the behavior of its parts taken separately.
Innovation in the energy sector is not optional; it's a necessity for sustainable growth.