adj. retractile ; retractable
在选一条小球蟒时，这条蛇应该有好的体重和伸缩自如的肌肉感。
When selecting a baby ball python the snake should have good body weight and muscle tone.
它有一双伸缩自如的柄眼、一对大耳朵，身体又胖又圆，还毛绒绒的。
It could move its eyes in and out on stalks, it had big ears and its body was fat and round and furry.
他们每个人身体外面都吊着一根精妙的，长长的有着自己意愿的伸缩自如的“东西”，我要是男人的话，我笑自己都来不及。
They have this delicate, long thing hanging outside their bodies which goes up and down by its own will. If I were a man I would always be laughing at myself.
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