冒口是在铸模内部增加的额外空间，用于容纳过多的熔化金属。
A riser is an extra void created in the mold to contain excessive molten material.
在此期间熔化金属可能从冒口回流供给零件以保持其形状不变。
During this time molten metal may backflow from the molten risers to feed the part and maintain the same shape.
而且浇冒口比较笨重，浪费大量金属液，出品率低。
Moreover the casting head is quite unwieldy, waste massive molten metals, the product rate is low.
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