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.
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.
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。
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