background n. 1.后景,背景;基本情况;(纺织品等的)底子;出身;经历。 2.隐蔽的[不引人注目的]地位;幕后。 3.衬托音乐,伴音;【无线电】干扰杂音 (students of workers' background. 工人出身的学生)。 in the background 背地下,背后;在幕后(活动)。
Vertical welds not completely removed by backgouging shall be performed vertically up , unless specifically approved in writing by secco 对于不能通过逆向刨削完全清除的纵向焊缝应垂直施焊,除非赛科公司有特殊的书面指示不用垂直施焊。