名词
中文翻译：非必需元素
同义词：
['unnecessary element']
例句：
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1.The presence of this element is crucial to the functioning of the system.
这个元素的出现对于系统的运作至关重要。
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2. The engineers found that a certain type of metal was an essential element in the construction of the bridge.
工程师们发现，某种金属是建造桥梁所必需的。
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3. The research team identified several elements that could potentially improve the efficiency of the process.
研究团队识别出几个可能提高过程效率的元素。