occasional lubrication非: mistake; wrong; errors正规: regular; standard; normal润滑: lubricating; lubrication; lu ...非正规: irregularity非正规背签: irregular indorsement下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:非正规润滑，即可在微信中查询翻译
