动词短语
中文翻译：下定决心
同义词：
['make a promise', 'pledge', 'swear', 'vow']
例句：
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1. I set my hand to the task and will not back down until it is completed.
我下定决心要完成这项任务，直到它完成。
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2. She made a promise to her friend that she would help them with their project.
她向朋友承诺会帮助他们完成项目。
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3. The couple made a vow to stay together for the rest of their lives.
这对夫妇发誓要一起度过余生。