成穴 meaning in English

cavitate
indention
indenture

Experimental research on precision rice direct - seeder with hill sowing
抛掷成穴式水稻精量直播排种器试验
Development and test of 1yc - 50 hydraulic pressure hole forming tree planter
50液压植树成穴机的研制与试验
Research on boring and caving principle of no - tillage punch hill - drop drill
冲孔免耕穴播机入土成穴原理的研究
Wood and parquet flooring - determination of resistance to indentation brinell - test method
木制和拼接地板.成穴阻力的测定.试验方法