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beware of a man of one book
01
一冊の本を読んだ男には気をつけろ
used to suggests that one should be cautious of people who base their entire worldview or beliefs on a single source of information, as they may be closed-minded and resistant to new ideas or information
例
The archbishop cautioned the cardinal to beware of a man of one book who bases all of his arguments solely on a single reference.
