背载型舱口盖驼载式舱口盖piggyback: adv.,adj. ＝pickaback. hatchcover: 舱盖; 舱口盖intravenous piggyback: 借道静脉输液法piggyback acknowledgement: 捎带应答piggyback board: 级联式插件板下载手机词典可随时随地查词查翻译
