negative skin friction表面: surface; superficies; bounda ...负: burden; load磨擦: rub; abrade; abrase表面负磨擦: negative skin friction表面磨擦力: surface friction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:表面负磨擦力，即可在微信中查询翻译
