注入口应尽可能的短。

Sprues should be as short as possible.

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以带圆孔的长方形为例，模拟比较了不同网格密度和注入口位置对充模时间、流动前沿以及干点形成区域的影响。

Flow front, filling time and dry spot were simulated and analyzed through comparing different mesh density and injection location such as the shape of the rectangle with hole.

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