检验证明书

testing(/inspection)certificate

• backgrounder
• background radiation
• backhander
• backing
• backloading
• backlog
• backlot
• backs
• backsheesh
• backstage
• backstairs
• backstop
• backswimmer
• backsword
• backtrack
• back-trick
• backup
• backward
• backwash
• backwater
• backway
• backwoods
• backyard
• bacolod
• bacon