短语
中文翻译：下定决心做某事
同义词：
['be determined to do', 'be resolved to do']
例句：
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1. I set my heart on becoming a doctor when I was young.
我年轻时立志要成为一名医生。
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2. She set her heart on winning the championship.
她立志要赢得冠军。
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3.He set his heart on pursuing a career in medicine.
他立志要从事医学事业。