ob-來(lái)自拉丁介副詞ob，原意是toward，在構(gòu)詞當(dāng)中又引申出against, inversely等意思。ob-是個(gè)原生詞綴，一般與拉丁詞根綴合，所構(gòu)成的派生詞的詞性取決于詞根或后綴的屬性。由于語(yǔ)音的同化作用，ob-在c，f，p前面，變成oc-，of- , op-。在元音字母及其他輔音字母前，ob-形態(tài)不變。

現(xiàn)先各舉一例說(shuō)明ob-出現(xiàn)在各種字母前的情況。 

obey [ob- = toward 向；ey (aud) = to listen 聽=>“to listen toward 聽從”→]v. follow the orders of 聽從，服從 / We only obey our leader. 我們只聽領(lǐng)導(dǎo)的。

obedience n. 服從，順從 

obedient a. 服從的，順從的，恭順的

obdurate [ob- = against 對(duì)抗；dur = hard 硬的；-ate a. = being =>“being hard against 硬頂著的”→]a. stubborn or unyielding 倔強(qiáng)的；頑強(qiáng)的/ He is an obdurate criminal. 他是個(gè)頑固不化的罪犯。

obduracy n. 倔強(qiáng)；頑固

object [ob- = against 對(duì)著；ject = to throw 扔=>“to throw sth. against將某物對(duì)…扔去”→“oppose sth. to以某物相對(duì)抗”→]v. be opposed 反對(duì) / Many people object to the proposal. 許多人反對(duì)該建議。

objection n. 反對(duì)，異議；不喜歡

oblige [ob- = toward 向；lig = to bind 束縛；-e=>“to bind sb. toward sth. 將某人束縛在某物上”→]v. bind by a promise, contract or duty; compel 以誓言、契約、責(zé)任等束縛；迫使/The law obliges parents to send their children to school. 法律責(zé)使父母送子女上學(xué)。