名词
中文翻译：替换交换
同义词：
['substitute', 'replace', 'substitute for']
例句：
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1.The teacher asked the students to substitute one of their own for the absent student.
老师要求学生中缺席的学生的一名同学代替他。
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2. They used a substitute teacher for the class until they could find a replacement.
他们用一位代课老师来上课，直到找到合适的替代者。
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3. The company decided to use a substitute for the injured worker in order to maintain productivity.
公司决定使用一位临时工来替代受伤的员工，以保持生产效率。