什么是Upstream Petroleum 和 Downstream Petroleum?如何翻译?

什么是Upstream Petroleum 和 Downstream Petroleum?如何翻译? upstream and downstream assets英文怎么翻译 Downstream or Upstream experience是什么意思 谁能帮翻译一下working with chevron petroleum company in UK I have w vaseline intensuve care pure petroleum jelly 英语翻译3.Factors Influencing Petroleum Hydrocarbon DegradationA petroleum it to industry______blood is to man. gas,gasoline,petrol,petroleum什么区别啊 Organization of Petroleum Exporting Countries 是什么 petroleum is to industry____blood is to man. 请问在石油术语中Upstream,middlestream,downstream是什么意思 120字英语作文——Petroleum Crisis .·