在六十年代晚期，一位年轻的加拿大精神病专家相信他找到了答案。
In the late 1960s, a young Canadian psychiatrist believed he had the answer.
直到二十世纪六十年代模糊理论的出现，语言的模糊性才得到了重视。
Until 1960s when vagueness theory came out, the vagueness of language was then taken seriously.
直到二十世纪六十年代模糊理论的出现，语言的模糊性才得到了重视。
Until 1960s when vagueness theory came out, the vagueness of language was then taken seriously.
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