Generally, tunnels are thus designed to operate under a drained condition. A great deal of uncertainties, however, remain concerning leakage controls in subsea tunnels.
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。
'family jet lag' is the condition people suffer when they are physically and emotionally drained by festive family trips.
“家庭时差”指的是在假日的家庭旅行之后，人们感到身体和精神上都很疲惫的情况。
The sand column, saturated at its lower portion and initially in the condition of hydrostatic equilibrium, is drained at its bottom at constant head.
砂柱下部饱和并处于静水平衡状态，在底部为定水头的条件下进行排水。
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