嚼一两片口香糖可能会使胃液回流入胃并使口腔分泌碱性唾液冲刷食道，中和胃酸，缓解由胃酸引起的“烧灼感”。
Chewing on a piece or two of gum, it seems, helps force fluids back into the stomach and flood the esophagus with alkaline saliva, neutralizing acids that cause the characteristic burning sensations.
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。
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.
在安装回流阀之前系统应该进行冲刷。
The system should be flushed before the backflow valve is installed.
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