downstreamadv.朝下游方向adj.顺流的downstream treatment process后处理工艺Downstream of Nenjiang River嫩江下游downstream interference body下游干扰体downstream development effect下游频散效应downstream open reading frame下游阅读框downstream develop ment effect下游发展效应downstream distribution matrix顺流分配矩阵downstream products of methanol甲醇下游产品Downstream floating of log raft木排流放downstream of/from the bridge桥的下游方向