1. And wherever a tributary emptys into a Yangtze, there is a city. 对于长江而言，每条支流的汇入都是一次水量的补充。
2. Fishermen in the Hafar Canal, a shallow tributary of the Euphrates River. 渔夫在幼发拉底河一条狭窄的水道——哈法尔水道中。
3. At this time, the Persians were still tributary to the Median Empire ruled by Astyages. 这个时候，波斯仍然向阿斯提亚吉统治下的米提亚人帝国进贡。
英英解释
n.
1. a branch that flows into the main stream
2. of a stream; flowing into a larger stream
3. paying tribute
4. tending to bring about; being partly responsible for
