一般来说，隧道的设计方案均允许适当排水，但是海底隧道设计为排水隧道时，存在流量控制等相关不确定性的因素。
Generally, tunnels are thus designed to operate under a drained condition. A great deal of uncertainties, however, remain concerning leakage controls in subsea tunnels.
炼油厂生产属于连续性生产，生产作业控制一般采用流量控制模式。
That which running daily in a refinery belongs to the procession of continuous production. Its job control program should be listed in the flow control model.
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