So often easily design overflow and air vent at inappropriate location, making casting generated gas hole.
所以常常容易因为溢流井与逃气道位置设计不当，使得铸件产生气孔的缺陷。
The pedestal pan body is provided with a plurality of air suction holes. The air vent is converged with a faeces-draining hole to use a same sewer.
在座便器体上有多个吸气孔，排气孔是与粪便排泄孔汇到一起，走同一个下水通道。
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