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请高手讲解一下前缀re和retro的区别,Thank you

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请高手讲解一下前缀re和retro的区别,Thank you
前缀re retro都有退,后退的意思,有什么区别呢?
e-
pref (used widely with vs and related ns,adjs and advs 可作许多动词及由动词派生的名词﹑ 形容词和副词的前缀) again 再; 又; 重新:reapply * redecoration * re-entered * reassuringly.
NOTE ON USAGE 用法:In many verbs beginning with re- the prefix is pronounced / rɪ-; rɪ-/ or / re-; rɛ-/ and it may have lost its original meaning of `again' or `back' 在以re-开始的许多动词中,这个前缀读作/ rɪ-; rɪ-/或/ re-; rɛ-/,并有可能已失去原来的‘再﹑ 又’或‘回’等意义:/ rɪ-; rɪ-/ recall,repair; / re-; rɛ-/ represent.Other verbs have had re- added to them with the meaning of `again' and it is pronounced / riː-; ri-/ 另有一些动词加re-表示‘再﹑ 又’之意,读作/ri:-; ri/:reopen; recreate.There are a few verbs which fit into both groups and a hyphenmay be used to show the distinction 还有一些动词适合於上述两种情况,可用连接号表示这种区别:recount`tell a story',re-count `count again'; recover = `get back' or `become well again',re-cover = `supply with a new cover'.
retro-
pref 前缀 (with adjs and ns 与形容词和名词结合) back or backwards 後; 向後; 在後:retroactive * retrograde *retro-rocket.