nozzle velocity of jet stream是什么意思

用法例句

Such work takes long period of time,characterized by big design flow,fast flow velocity at closure gap and large water head.

针对长洲水利枢纽工程施工期需先后完成三条江的截流,施工时间跨度长,截流设计流量、龙口流速及落差较大,坝址属较易被冲刷的软基河床等特点,截流设计需综合考虑通航及向下游供水等外部条件的制约,妥善解决各项技术难题。