战争是一场悲剧，但有时是必要的。
War is a tragedy, but sometimes necessary.
心理学是科学，教学是艺术；科学永远不会直接从自身产生艺术。
The concept of legal obligation is central to the understanding of law.
Politics is every citizen's duty, and avoiding politics is itself a political stance.
采矿技术的创新将是该行业在下个世纪保持活力的关键。
The body is not a thing, it is a situation: it is our grasp on the world and our sketch of our project.