前缀：ob-

【词根含义】：相反;离开;对面;在...上面;来,临近;加强意义

【同源单词】：obdurate, obedience, obey, object, objection

前缀：ob- 表示“逆, 倒, 加强意义”

oblique 倾斜的（ob+lique歪斜→歪斜的）

oblivion 忘却，忘记（ob+liv活＋ion→[记忆]不活了→忘记）

obscure 模糊的（obs=ob+cure关心→不关心→记不住了→模糊的）

obsolete 过时的（ob离开＋sol太阳＋ete→离开太阳了→放在角落不用了）

obsolete 钝的；愚蠢的（ob+tuse可能来自use→不能用了→钝的）

词根词缀：ob-1

【来源及含义】Latin: toward, to, before

【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】oblige, obsequious, obstetrics, obverse, obvert, offer

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-3

【来源及含义】Latin: across, over, upon

【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】obfuscate, obscure

词根词缀：ob-4

【来源及含义】Latin: down

【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】occasion

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