相关单词近义词 allied 联合的, attached 附加的, associated 联合的, linked 连接的, added 附加的, pig-a-back 在铁道平车上..., pickaback 骑在背上肩上...临近词piggy, piggy-backing, piggyback board, piggyback rights, piggy backsystem, piggyback system, piggyback twistor, piggyback control, piggyback traffic, piggyback service, piggy back system 返回 piggybacking