agile
a.活潑的；敏捷的(nimble)→ag, to act

docile
a.可教的；溫順的(tractable)→doc, to teach

ductile
a.可延展的；溫順的(tractable)→duct , to lead

fertile
a.多產的，肥沃的(fruitful)→fer(t) , to bear

fragile
a.易碎的，脆的(delicate)→frag, to break
→frangible ['fr$ndIDb9] a.易碎的；frang, break

juvenile
a.少年的，幼年的(young)；不成熟的(immature)
→juven, yound ; -ile , like, related to

puerile
a.稚氣的(childish)；膚淺的(silly)→puer, boy

servile
a.奴隸的；卑屈的(submissive)→serv, a slave

volatile
a.揮發性的；易變的(fickle, unstable)→vola, fly