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

upstream 什么是Upstream Petroleum 和 Downstream Petroleum?如何翻译? upstream project upstream pier upstream是什么意思 upstream segment是什么意思? 美国upstream是什么意思 Downstream or Upstream experience是什么意思 【英文翻译】Further upstream,a fisherman got mail. Learning is like upstream,not degrade! upstream and downstream assets英文怎么翻译 The proxy server received an invalid response from upstream server.-------------------------------------------------------------------------------- The proxy server received an invalid response from upstream server. gateway received an invalid response from the upstream gateway 翻译 learning is like rowing upstream:not to advance isto dropback. 请问在石油术语中Upstream,middlestream,downstream是什么意思 Upstream regulators是什么意思?这是分子生物学里面的单词 关于石油这个词请问究竟是petroleu还是petrolum?两者我都看到了,但总体来说仿佛单个词试试petroleum,放到词组里就是petrolum了.