Drainage was left to open sewers , canals and sluices , which often proved ineffective .

排水的责任留给了下水道、河渠和水闸这些设施，事实证明效果往往有限。

Drainage was left to open sewers , sluices and canals , none of which was particularly effective when rains came .

排水的任务交给开放式水渠、水闸和运河，下雨时没有一个是特别有效的。

These results are very important for the selection , location , design , security and economy of sluices .

这些对于保证闸址选择、水闸设计的经济性、安全性具有很重要的意义。

Article 22 when building sluices and dams which will have serious effects on fishery resources on the migration routes of fish , shrimp and crabs , the construction units must build fish passages or adopt other remedial measures .

第二十二条在鱼、虾、蟹洄游通道建闸、筑坝，对渔业资源有严重影响的，建设单位应当建造过鱼设施或者采取其他补救措施。

When building sluices and dams which will have serious impact on fishery resources on the migration routes of fish , shrimp and crabs , the construction entities must build fish passages or adopt other remedial measures .

在鱼、虾、蟹洄游通道建闸、筑坝，对渔业资源有严重影响的，建设单位应当建造过鱼设施或者采取其他补救措施。