piggyn.小猪adj.贪心的piggyback distribution分段运销piggy-back promotion附加赠品piggyback traffic load背运输piggyback trailer train背负式拖车列车piggy-back legislation一揽子法案piggyback twistor memory复合磁扭线存储器piggyback characteristic背驮式特征piggyback acknowledgment背页式应答piggy-in-the-middlen.一种小孩玩的传球游戏piggyback acknowledgement捎带应答

1. Effects of dietary iodine level on reproduction performance of gestation sow.
   日粮中碘水平对妊娠母猪繁殖性能的影响。