1、During the 1990s, this river discharged over 100 million pounds of toxics downriver each year.
20世紀90年代，這條河每年向下游排放超過1億磅的有毒物質(zhì)。

2、Cologne is not so very far downriver from Mainz.
科隆離美因茨的下游處不遠。

3、Sightseers drifted downriver on a raft.
觀光客們乘著木筏漂向下游。

4、Sightseers drifted downriver on a raft
觀光客們乘著木筏漂向下游。

5、Once the upstream reservoir breaks dam, the downriver dam will be threatened.
一旦出現(xiàn)潰壩，必將威脅下游水庫的安全。