2figurativeOccurring earlier than something else; (also, usually, especially) being an influence on something else; causing a consequence for something else.
副词adverb
1
Against the current.
动词verb
1intransitiveTo stream upward.
2transitive, open-source softwareTo have (a softwarelibrary, patch, etc.) accepted by the originaldevelopers of the related software, so that they maintain and distribute it.
名词noun
1Part of the river towards the upstream direction.