Time is like a river, can only flow can not go back.
时间好比河水，只能流去不能回。 。
The river's natural flow is from west to east, into the Mekong. But the Mekong becomes so swollen with monsoon rain that it pushes water uphill, back up the Sap river.
河水由西向东自然流动，汇入湄公河，但是湄公河已经饱和了，它将河水向上倒逼回洞里萨河。
The test results show that the apron can reduce back flow at the dam toe, and the piers can obviously diminish river bed scouring near the scour resistant wall.
试验结果表明：护坦减轻了下游纵向围堰左侧坝趾处的回流淘刷，隔流墩明显减轻了防冲墙附近河床的冲刷，确保了坝基和下游纵向围堰的安全。
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