解释：使用毒性大的药物治疗疾病时，病情十成中只能去掉六成就要停药，以免伤害正气。
音乐让我找到了人生的方向。
我们能做的最佳投资就是为后代的健康而努力。
The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.
The dialogue between scientists and the public is crucial for responsible innovation.