从词性来说,“案外”是副词和形容动词,“意外”是形容动词,“思いがけをく”是由形容词变成的副词。在中文里这三个词都可以解释为“意外、没想到”等意思,很容易混淆。这里谈谈它们作副词使用时在用法和意义上的区别。 From the part of speech, “outside the case” is an adverb and describe the verb, “accidental” is to describe the verb, “think い が け o ku” is an adverb into an adjective. In Chinese, all three words can be interpreted as “accidents, did not expect” and other ideas, it is easy to confuse. Here to talk about their use as adverbs in the usage and significance of the difference.