1. C 拓荒者；开发者　 person who is among the first to go into an area or country to settle or work there
2. C 探险者　 person who goes into previously unknown regions; explorer
3. C 探索新知识领域的人　 person who is the first to study a new area of knowledge
4. C 工兵　 any one of a group of soldiers who go into an area in advance of an army to clear paths, make roads, etc.

　act as ～　起先锋作用
　reinforce ～　增援先驱者
　celebrated ～　著名的先驱者
　early ～　早期的拓荒者
　fearless ～　无所畏惧的开拓者
　venturous ～　爱冒险的开拓者
　～ pilot　首航飞行员
　～ plan　最早的计划
　～ wagons　拓荒者的四轮马车
　～ work　探索新知识领域的工作
　～ in　在…方面的先锋〔驱〕
　～ in the use of X-rays　使用X光的先驱
　～ in work of　在…工作方面的先锋
　～ of　…的先锋〔驱〕
　～ of new era　新时代的先驱者

　Pioneers from the East settled in this region in 1875. 　1875年，来自东部的拓荒者在这个地区定居下来。
　The pioneer who stayed and lived and succeeded was proud of himself.　留下在那儿生活并取得成功的先驱者为自己感到骄傲。
　He is a pioneer in modern medical practice.　他是现代医学实践的先驱。
　He is a pioneer of social reform.　他是社会改革的先驱。
　He is a pioneer of heart transplant operations.　他是心脏移植手术的开创者。
　The Russians were the pioneers of space travel.　俄国人是宇宙航行的先驱。
　They were pioneers in the field of microsurgery.　他们是显微外科学领域的创始人。
　They are Young Pioneers.　他们是少先队员。

1. vi.当拓荒者，当开发者　 act as a pioneer
2. vt.开拓，开辟　 begin or help in the early development
3. vt.倡导；促进…的初期发展　 be the first person to develop; help the early development of sth

　～ a new method　探索新方法
　～ the Northwest Territory　开垦西北领土
　～ the use of　开创…的使用方法

　The Wright brothers pioneered in early aviation.　莱特兄弟是早期飞机制造业的探索者。
　They pioneered the Northwest Territory.　他们开垦了西北领土。
　She pioneered the short haircut for women.　她倡导了妇女的短发型。
　She pioneered the use of the drug.　是她最先使用这种药品。
　This company pioneered the use of silicon chip.　这家公司开创了使用硅片的方法。

　［同义词］ n. developer, explorer, founder, leader, settler v. create, develop, discover, establish, invent, originate
　［词源］　法语pionnier<古法语peonier（步兵）