大学英语：Their meanings are known to every educated person

　　6.Their meanings are known to every educated person， but there is little occasion to use them at home

　　occasion 通常可以做可数名词用，意思是“时刻、场合”;也可以做不可数名词用，意思是：“必要性、需要;机会”。如：

　　1)They're met on several occasions (他们已相遇过好几次)

　　2)They are occasions when you find it difficult to say “Good-bye”。(有时候你会觉得说“再见”很难。)

　　3)I don't remember I had occasion to blame him (我不记得我有责备他的必要)

　　7.In the latter， we are using a Latin Derivation which has exactly the same meaning

　　在前一句中用了“in the first case，” 本句中的“in the latter ”是指in the latter case .对两件事分别进行表述时，可以用in the first case， in the latter case 这一类词，条理非常清楚，也可以用the former，the latter 来表述。derivation 是derive 的名词形式。Latin derivation 意思是“拉丁语词源的词”，请看例句：

　　1)These words are derived from Latin (这些词由拉丁语派生而来)

　　2)The derivation of words is interesting (词的派生很有意思)