An experienced, worldly-wise, and shrewd person, typically someone who has spent many years dealing with various social situations and people.
他在这一行摸爬滚打了几十年，是个真正的老江湖，经验非常丰富，大家都很信任他的判断。
He has been working in this field for decades; he's a true old hand, with a wealth of experience, and everyone trusts his judgment.
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