片语
the upper stream上游
upper-stream industry上游产业
Upper-stream Petroleum Enterprise石化企业上游
along upper jet-stream顺着喷射气流
upper reaches上游,上游河段
upper stream supply chain上游供应链
Upper Stream of Beiluohe River北洛河上游
headstream源头,河源水流
upper stream water上游水
upper jet stream高空急流
upper stream supplier上游供应商