原级：retract
现在分词：retracting
retracts
过去分词：retracted
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过去式：retracted
1. 可收放起落架：MONOPLANE--单翼机 | RETRACTS--可收放起落架 | STRUT--支柱
2. 缩回,收缩：fundic底的,基底的 grasper | retracts缩回,收缩 | periportal门静脉周围的
1. But the skin dries out and retracts after death, giving the appearance of longer hair or nails.