名词
中文翻译：Unknown
同义词：
['promiser', 'pledger', 'warrantor']
例句：
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1. He promised to return the borrowedbook by the end of the week.
他承诺在一周内归还借来的书。
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2.The promisor made a promise thathe would finish the project before the deadline.
诺言者承诺在截止日期前完成项目。
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3. The promisor was found guiltyof breaking their promise.
诺言者因违背承诺而被判有罪。