The water tunnel of gravitational type is driven by the water's potential energy.

水洞种类之一的重力式水洞依靠水的势能来提供动力。

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The results are in good agreement with those of the water tunnel flow visualization results, except the periodic and unstable flow.

除了不稳定流动区域，计算结果与流场显示结果符合良好。

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The water tunnel and wind tunnel test on arrow aims to make clear the hydrodynamics performance of arrows and to improve the technical know-how of archery movement.

为分析箭的流体力学性能，进而完善射箭动作技术理论，对箭进行了水洞和风洞实验。

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He breached the Assyrian siege by digging his famous water tunnel under the city.

CENTERFORSECURITYPOLICY: Jerusalem, the Eternal Front Line

Even on a dry day, the MTA's 300 pumping rooms remove an estimated 13 million gallons of water from the tunnel network, just to keep the system dry enough to run.

WSJ: Salt Water Puts City's Subway System 'in Jeopardy'

Engineers have now pumped out the water and can now get to the tunnel beneath and renovate the tunnels.

BBC: Crossrail recycling lost heritage under London