ullage桶: barrel; bucket; commode; keg ...空隙: interval罐顶空隙: ullage头顶空隙: head clearance顶空: head space; headspace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:桶顶空隙,即可在微信中查询翻译