firm使: send; tell sb. to do sth.牢固: firm; secure; fast; solid使牢记: engraft; ingraft牢固: firm; secure; fast; solid 牢固的基础 solid [firm] foundation; 牢固接合 firm and impervious joint不牢固: insecure; tendering下载手机词典可随时随地查词查翻译