| 释义 |
upstream
I. \ˈ ̷ ̷| ̷ ̷\ adverb
Etymology: up (IV) + stream, n.
: in a direction nearer the source of a stream
< traveled upstream >
< an extensive tract a few miles upstream — American Guide Series: Louisiana >
II. adjective
1. : directed upstream
< an upstream course >
2. : situated or occurring upstream
< the upstream countries — F.W.Morgan >
III. adverb
1. : in or to a position within the production stream closer to manufacturing processes
2. : in a direction along a molecule of DNA or RNA opposite to that in which transcription and translation take place and toward the end having a hydroxyl group attached to the position labeled 5′ in the terminal nucleotide
< a nucleotide sequence located upstream of the initiation codon >
— compare downstream herein
IV. adjective
: of or relating to a portion of the production stream closer to basic extractive or manufacturing processes
< an upstream chemical manufacturer >
< upstream profits > |