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
观音阁水库底孔坝段采用碾压混凝土尚属国内首例。
Roller crushed concrete is adopted first within our country in DAMS with bottom conduits in Guanyinge reservoir.
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.
同时，结合生产任务，为龙滩底孔弧形闸门的优化设计和安全运行提供参考意见。
Finally, combined with productive tasks, some Suggestions are provided for the optimum design and safe operation for Longtan bottom radial gate.
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