The ice blocks up the river, making the upstream water unable to flow.
冰把河道堵住
, 
的
流
下来。
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And key to this canal systems design were barrages: Dam like infrastructure that raised the river's upstream water level so that water can be funneled into canals with gates that open and close depending on water supply and demand.
这种运河系统设计
关键是堤坝:像
坝一样
基础设施,
以提高河流上游
位,这样

以流入运河,闸门
以根据
供应和需求打开和关闭。
They will try and establish some control or some say over a particular type of peppers throughout the industrial train, the upstream and downstream, so they can sort of gain a level of say in determining the prices to some extent.
他们将努力在整个产业链——包括上游和下游——对某种特定类型
辣椒施加一定程度
控制或影响力,以便在某种程度上对定价产生一定
话语权。