词根词缀：systol-, -systole, -systolic, -stole

【来源及含义】Greek > Latin: contraction; to draw together

【同源单词】bradydiastole, diastole, diastolic, extrasystole, hypodiastole, hyposystole

词根词缀：tra-, tract-, trac-, -tractive, -traction, -tracting, treat-, trai-

【来源及含义】Latin: drag, draw together; a drawing out or pulling

【同源单词】abstract, abstract, abstracted, abstractedly, abstractedness, abstraction