second-hand的复数形式怎么拼写？

adj.旧的，二手的，用过的，间接得来的，（学说等）不是独创的n.（钟表的）秒针，旧货adv.间接地，第二手地...

second-hand的音标：...

All this, needless to say, had been culled second-hand from radio reports.不用说，所有这些都是从电台报道中采集来的二手材料。The second-hand version is a poor copy of the original.盗版版本是对原版的低劣复制。We just can't find enough good second-hand cars...