A self-sacrificing person gives up what they want so that other people can have what they want.

These people were unselfish, self-sacrificing, and sincerely concerned about the general good. 这些人是无私的、具有自我牺牲精神的，真诚地关心大众的利益。

His courage and self-sacrificing devotion to duty resulted in the loss of his life. 他的勇气和自我牺牲精神让他献出了自己的生命。