There are people who have given their lives to rescue others, or dedicated themselves to some great work, like bringing sight to the blind of India or Africa, or saving the world from environmental disaster.

• 确实有一些人为求助别人而舍弃了自己的生命，或者投身于某些重要的工作，比如治疗印度和非洲的失明者，治理世界的环境。