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了解自己也了解對方。
出自《孫子兵法·謀攻篇》：「知彼知己，百戰不殆。」
「知己知彼，百戰百勝，先做好市場調查再行動。」
Data source: Ministry of Education Idiom Dictionary (data.gov.tw, OGDL). For reference only.
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