photographic negative照相: take a picture; take picture ...底: bottom; base照相底板: photographic plate; photoplate照相底版: photoplate照相底版纸: negative photographic paper; negative phototgraphic paper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:照相底，即可在微信中查询翻译
