A sufficient flow of gas to produce clear difference of water level in the three manometer legs can be generated by blowing through the tube.
当有足够的 气体流入时，即可发现三条管中之液体产生不同高度的变化。
There wasn't enough difference between the height of the ground level and the water level.
地面高度与水位没什么明显的区别。
The paper introduces design and construction methods using blasting to remove clay dam in the case of water level difference for both sides of the dam.
结合实例阐述在粘土坝两侧有水位差的情况下，用爆破法拆除的设计与施工方法。
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