动词短语
中文翻译：必须
同义词：
['be obliged to', 'be bound to', 'be required to']
例句：
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1. The company is incumbent on us to provide a satisfactory response.
公司有责任我们提供令人满意的回应。
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2. He was incumbent on me to take the initiative.
他要求我主动采取行动。
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3. She felt incumbent on him to help her through the difficult times.
她觉得有责任帮助他度过困难时期。