名词
中文翻译：Unknown
同义词：
['substitute unit', 'substitute device', 'substitution unit']
例句：
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1. Thereplacement unit is designed to replace the old one.
这个替换单元被设计来替换旧的。
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2.The engineers are replacing the old system with a new one.
工程师们正在用新的系统替换旧的。
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3.The replacement unit has been tested and found to be reliable.
替换单元经过测试，被发现是可靠的。