短语词组短语Swam downriver 向下游游泳;顺流独木舟赛downriver channels 下行通道downriver ventilation 下行风downriver boat 下水船downriver downstream 船从上游向下游行驶downriver lower 下游的downriver channel 下游河道downriver area 下游区Huaihe River downriver 淮河下游 返回 downriver