级联式插件板piggyback: adv.,adj. =pickaback. board: n. 1.板〔通常指宽4英寸半以上厚2英寸半以下者〕,木 ...intravenous piggyback: 借道静脉输液法piggyback acknowledgement: 捎带应答piggyback car: 背负运输车下载手机词典可随时随地查词查翻译