1、 The teacher is a selfless person who always helps others.
这位老师是个无私的人,总是帮助别人。(形容词,由self加否定后缀less构成,中考常考派生词)
来源:【中考难度例句】秒词邦编辑整理
2、 Behaving in this selfless and devoted manner, these little creatures have survived on earth, for more than 140 million years, far longer than dinosaurs.
这种无私奉献的行为,使这些小生物在地球上生存了超过1.4亿年,远远长于恐龙。
来源:2015年高考英语安徽卷 阅读理解 阅读D 原文