[kāi tuò]
（开辟； 扩展） open up; reclaim; extension; open-out prolongation; baring
exploit the urban and rural markets
开拓城乡市场
reclaim wasteland
开拓荒地
develop [explore] markets
开拓市场
open up a path for the development of oil industry
为发展石油工业开拓一条道路
start contacts between China and the United States
开拓中美两国的联系
Chinese settlers helped tame the American continent during the 19th century.
中国移民在19世纪为开拓美洲大陆作出了贡献。
[矿] （采掘前修建巷道等工序总称） developing; opening
[数] extension