acronym和abbreviation有什么不同?

acronym 首字母组成的缩写
a word formed from the first letters of the words that make up the name of sth,for example ‘AIDS’ is an acronym for ‘acquired immune deficiency syndrome’
abbreviation 简写,缩写
a short form of a word,etc.:
What’s the abbreviation for ‘Saint’?

这两个都是短语的缩写，然后根据所写出来的那些英文字母能否发音来决定是哪一个，比如说Teaching English to Speakers of Other Languages可以缩写为Tesol，Tesol可以读出来（体艘），所以属于Abbreviations，如果缩写的东西读不出来，比如chief executive officer缩写出来是CEO，只能读C，E，O，就属于Acronym，我是...