backing
n.
衬背,援助,支持者,赞助者
习惯用语backingoff卸下backingup回投havethefullbackingof得到...的充分支持
(1)Ingrinding,thematerial(paper,cloth,orfiber)thatservesasthebaseforcoatedabrasives.
(2)Inwelding,amaterialplacedunderorbehindajointtoenhancethequalityoftheweldattheroot.Itmaybeametalbackingringorstrip;apassofweldmetal;oranonmetalsuchascarbon,granularfluxoraprotectivegasatmosphere.(3)Inplainbearings,thatpartofthebearingtowhichthebearingalloyisattached,normallybyametallurgicalbond.