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冒险主义者;投机者
If you describe someone as a gambler, you mean that they are ready to take risks in order to gain advantages or success.
例句
He had never been afraid of failure: he was a gambler, ready to go off somewhere else and start all over again.
他从来都不害怕失败:他是个冒险家,随时准备到别处从头再来。