底孔一般是指用丝锥攻内螺纹之前所预制的孔的直径，一般指加工件的内置圆孔，最底或最面上的圆形孔洞，称之为底孔。
n. underport
misc. bottom hole
Under certain incoming,as the decrease of bottom aperture and conical distance,the concentration rate is increased. The results is important guilding significance to the optimization of shuttle-conical tube.
进流量不变时,浓缩率随着底孔孔径和锥圈间距的减小而增大。
参考来源 - 梭锥管混浊流体分离装置水沙分离试验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文结合岩滩泄水底孔减压试验，讨论了三个问题。
Three problems on the depression test of Yantan outlet are discussed.
施工实践证明，底孔压浆混凝土强度高于普通混凝土强度。
The construction practice proves that the grouted concrete strength higher th an the normal concrete strength.
研究了两种调度方案，即10个底孔间隔开启方案和分区调度方案。
The first scheme is that the operations of 10 bottom outlets were used in interval, and, the seeond , in subregion regulation.
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