名词
中文翻译：封闭的轴
同义词：
['closed casing', 'sealed shaft']
例句：
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1.The machine's closed shaft is essential for its operation.
机器的封闭轴对其运行至关重要。
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2. The engineer carefully inspected the closed shaft to ensure it was functioning correctly.
工程师仔细检查了封闭轴，确保其正确运作。
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3. The closed shaft is a crucial component of the machine's design.
封闭轴是该机器设计中的关键部件。