单词	老底
释义	老底 lǎo dǐpast; unsavoury background
随便看	production emulation campaign production energy consumption production engine production engineer production engineering production engineering advisory service Production Engineering Division Production Engineering Measure production engineering research association Production Engineering Specifications Production engineering technician Production Engine Quality Control production enterprise production enterprises production environment production environmental test production environmental testing Production environment control production equilibrium production-equilibrium production equipment Production Equipment Agency Production Equipment Code Production Equipment Control Office Production Equipment Package