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有影響力的政客（或商界人士）;政界（或商界）大人物
If you refer to someone such as a politician or a businessman as a heavy hitter or a big hitter, you mean that they are powerful and influential.
例句
...friendships with heavy hitters like European industrialist Carlo De Benedetti.
和歐洲實業家卡洛·德·貝內代蒂等大人物的友誼