详细解释:a. 背着的, 在背肩上的
ad. 背着, 在背肩上
词型变化：
动词过去式:piggybacked过去分词:piggybacked现在分词:piggybacking第三人称单数:piggybacks英语解释：
名词 piggyback:
the act of carrying something piggyback动词 piggyback:
ride on someone's shoulders or backhaul truck trailers loaded with commodities on railroad carshaul by railroad carsupport on the back and shouldersbring into alignment with副词 piggyback:
on a railroad flatcar同义词：pickaback, pig-a-back