资料来源 : pyDict

伸出,突出

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Protractile \Pro*tract"ile\, a.
   Capable of being protracted, or protruded; protrusile.

资料来源 : WordNet®

protractile
     adj : able to be extended; "protractile muscle" [syn: {protractible}]