Another enjoyable thing about etymology for most word experts is solving word mysteries（谜）． No, etymologists do not go around solving murders, like the great detective Sherlock Holmes． What these word experts solve are mysterious origins of some of our most common words

　　One of the biggest questions English language experts have pursued is how English came to have the phrase OK． Though it is one of the most commonly used expressions, its exact beginning is a puzzle even to this day． Even its spelling is not entirely consistent-unless you spell it Okay, it is hard even to call it a word．

　　Etymologists have been able to narrow OK’s origin down to a likely, although not certain, source（来源）． It became widely used around the time of Martin Van Buren's run for president in 1840． His nickname was Old Kinderhook． What troubles word experts about this explanation is that the phrase appeared in some newspapers before Van Buren became well known． It is likely that Van Buren could be called its primary source Etymologists will doubtlessly keep searching for the initial source． However, it is clear that OK’s popularity and reputation have topped those of the American president to whom it has been most clearly linked．

　　【文章解读】本文是语言知识文章阅读。本文主要告诉我们英语单词或词根给人们带来学习语言的快乐。

　　63． The author mentions the words like "croissant" in Paragraph 2 to indicate

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