名词
中文翻译：内部表面积
同义词：
['internal cross-sectional area', 'internal volume', 'internal surface volume']
例句：
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1. The new model car has a much larger internal surface area than the old one.
新款汽车的内部表面积比旧款大得多。
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2.The engineer calculated the internal surface area of the machine to ensure it would fit into the space.
工程师计算了机器的内部表面积，以确保它能够适应空间。
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3. The scientist measured the internal surface area of the sample to determine its composition.
科学家测量了样本的内部表面积，以确定其成分。