Psychology must be purely experimental and analytical.

Success is not measured by profits alone, but by the positive impact we create.

The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.

文明被描述为对一系列挑战的回应结果，而其中最大的挑战始终是气候。

我不喜欢过度思考音乐，它应该自然流淌。