筒具有前端，该前端的端部是围绕开口的边缘，该边缘的外周边基本上等于筒的外周边。
The barrel has a front end terminating in an edge surrounding the opening, the edge having an outer circumference substantially equal to the barrel outer circumference.
第一阻隔件，该第一阻隔件可滑动地设置在所述第一端部和第二端部之间的所述壁内，所述第一阻隔件与所述内部表面形成液体紧密密封并具有前端；
A first stopper (18) is slidably disposed within the wall between the first and second ends, the first stopper defining a liquid-light seal with the inner surface.
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