名词
中文翻译：额外的
同义词：
['superfluous', 'unnecessary', 'extraneous']
例句：
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1. The extra materlal was a great help to us.
额外的材料对我们来说是一大帮助。
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2. He spent extramaterlal time on his research.
他在研究上花费了额外的时间。
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3. The extramaterlal expenses were unexpected.
额外的费用是出乎意料的。