请将下面这段话翻译成英文：

三无科学家

“三无科学家”是指在没有博士学位、无留洋背景和无院士头衔的时候，就在研究领域获得了举世瞩目的成果的科学家。例如，获得诺贝尔奖的屠呦呦、“杂交水稻之父”袁隆平，和河北科技大学副教授韩春雨等。

参考译文

Scientists of “Three Had-nots”

Scientists of "three had-nots" are scientists who had no doctorate degrees, no overseas studying experiences, or the fellowship of national science academies and who nevertheless make world-famous breakthroughs in their research. Tu Youyou, the doctor who won the Nobel Prize and Yuan Longping, the “Father of Hybrid Rice” are among those scientists of “three had-nots”.

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