vt.不充分供料(供料不足；下给；下部进料)
A modified form of sprue gate is also used on underfeed moulds and runnerless moulds. 在点浇口形式的模具或无流道模具中也用到另一种形式主流道。
The grooved head of the sprue puller creates an effective undercut which is used to pull the sprue, or secondary sprues in underfeed designs. 主流道拉料杆头部的凹槽形成了一个有效的底切，可以用来拉出主流道或者是下进料设计中的二级主流道。
Based on the analyse of straw characteristics (i.e. bulk density, moisture and volatile matter), underfeed stoker and double combustion chambers are introduced in the designing of straw boiler. 通过对秸秆物料本身特性(堆积密度、含水率和挥发分)进行分析,在秸秆锅炉的设计中采用下饲式进料方式和双燃烧室结构。
Central gating for this type of impression can, however, lead to complications in multi-impression moulds as either an underfeed mould(Chapter 12) or a hot runner mould (Chapter 13) will be required. 可是这类型腔采用中心浇口可能要求使用一种点浇口。（第12章）或热流道模具（第13章）使得多型腔模具的复杂性增加。
