动词
中文翻译：保证
同义词：
['ensure', 'guarantee', 'warrant']
例句：
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1.The company promises to deliver the goods on time.
公司承诺按时交货。
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2. The teacher guaranteed that the exam would be fair.
老师保证考试会公平。
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3.The agreement guarantees us a discount for our next purchase.
该协议为我们下次购买提供折扣的保证。