名词
中文翻译：Unknown
同义词：
['core system', 'core component']
例句：
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1. Thekey telephone set is the most important pieceof equipment in our office.
电话机是我们办公室最重要的设备。
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2. The company's corecomponents are all made in-house.
该公司的所有核心部件都是自制的。
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3. The engineers worked on the key telephone set tofix the problem.
工程师们正在修理电话机以解决问题。