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我们过去在松紧水泵塞线压盖时,是用扁(?)来(?)塞线压盖边缘上的突出体,突出体在扁(?)的(?)顶下,
In the past, when we squeezed the plug of a water pump plug, we used a flat (?) to (?) the protrusion on the edge of the plug gland, and the protrusion was under the top of the flat (?).