英:[θɜ:l]
美:['θɜl]
封建时代佃农必须在某家碾谷厂碾谷的规定;
穿孔,钻孔,开掘联络巷道;
1 孔
eye box hole port opening mesh hollow aperture pore gouge orifice porosity os ostium introitus
2 颤动
pulsant vibrant aspen pulsatile fluttery palsied working thrill vibration tremor flutter palsy vibrancy trill toss vibrate pulsate librate dirl work twitter flicker
3 穿孔
perforative perforate fenestrated punch boring puncture stave
4 钻孔
boring drilling drill bore spin bore-hole