词根词缀：extra-, extro-, extr-, exter-

【来源及含义】Latin: beyond, outside, on the outside, outward, external

【同源单词】Ab extra, ad extra, ad extremum, exteriorly, external, external reforming

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