The water level rises in the cistern after you flush.冲水后水箱的水位会上升。Pipes in the loft begin lagging at the cistern.阁楼的管道开始慢慢地往蓄水箱里蓄水了。The cistern receives rainwater from the roof.贮水器承接屋顶流下的雨水。The police found the pistol hidden in the lavatory cistern.警察找到了藏在厕所水箱里的手枪。