1.Well. I guess one of a doctor's duties is to prevent suffering and sometimes killing is the only way to do it.
我想医生的职责之一就是不让病人受苦，有些时候让他们反而对病人来说是种解脱。
2.They prevent suffering, disability and more than two million deaths per year (2003).
疫苗每年预防了200多万人的痛苦、残疾和死亡（2003年）。
3.Antinatalism, the belief that it is inherently immoral to bring people into the world e. g. in order to prevent suffering in a child's life.
人口控制，认为带更多人到世界上来天性不道德，例如为防止孩子一生遭受痛苦。