名词
中文翻译：Unknown
同义词：
['principal part', 'main component']
例句：
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1.The engineer designed the master workpiece for the machine.
工程师为机器设计了主件。
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2.The master workpiece was assembled by a team of skilled workers.
主件由一支熟练工人团队组装完成。
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3.The master workpiece is crucial to the functioning of the machine.
主件对机器的运行至关重要。