形容词
中文翻译：外来的
同义词：
['non-essential', 'non-native']
例句：
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1.The extraneous details were not important to the main story.
这些非关键细节对主要故事不重要。
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2. The extraneous noise from the construction site was distracting.
工地的非必要噪音让人分心。
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3. Extraneous factors can affect the outcome of an experiment.
非必要的因素会影响实验的结果。