Flat appearance rules, straight edges and corners are more square, with flat, parallel to the following left and right side, or vertical or inclined.

外形扁平规则，棱角较为方直，具有平整、平行的上下面，左右侧面或垂直或倾斜。

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A small flat-bottomed boat with square ends, paddled or poled on shallow waterways.

一种平底小船，两头为方形，用浆或篙在浅水航道划行。

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The spray holes on the distribution disc are arranged according to a regular triangle or a square, and the baffle plate is a circular or square or triangular flat or convex or tapered plate.

分布盘上喷淋孔按正三角形或者正方形排列，挡板为圆形、方形或者三角形的平板、凸板或者锥形板。

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