名詞 tributary:

1. a branch that flows into the main stream
   同義詞：feeder, confluent, affluent

形容詞 tributary:

1. of a stream; flowing into a larger stream
2. paying tribute
3. tending to bring about; being partly responsible for
   同義詞：conducive, contributing, contributive, contributory

1. A tributary colony.
   進貢的殖民地
2. There was one street apart from a tributary road near the end of the village.
   除了村子盡頭的岔道外，還有一條大路。