名词短语
中文翻译：机器改进时间
同义词：
['machinery improvement time', 'machine maintenance time']
例句：
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1. The machine is not working properly, so we need to improve its machinery.
这台机器工作不正常，我们需要改进它的机械部分。
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2. During the machine improvement time, we should pay attention to the safety of the workers.
在机器改进时间期间，我们应该关注工人的安全。
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3.The machine improvement time is crucial for maintaining the equipment's efficiency.
机器改进时间对于保持设备效率至关重要。