词根词缀：ob-2

【来源及含义】Latin: against

【相关描述】Before c, ob- becomes oc-; before f, ob- becomes of-; before g, ob- becomes og-; before p, ob- becomes op-; before m, ob- becomes o-

【同源单词】obduracy, obdurate, object, objection, objectionable, objective

词根词缀：ob-5

【来源及含义】Latin: completely, totally

【相关描述】Before c, ob- becomes oc-; before f, ob- becomes of-; before g, ob- becomes og-; before p, ob- becomes op-; before m, ob- becomes o-

【同源单词】observe, obsess, obsolete, obsoletely, obsoleteness, occupy

词根词缀：sed-, sedat-, -sid, -sess

【来源及含义】Latin: sit, sitting

【同源单词】assess, assessable, assessment, assessor, assessorial, assiduity