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1. The model's design is based on a hypothetical center of gravity.
该模型的设计基于一个假想的重心。
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2. The scientist made an assumption that the earth's center of gravity would shift.
科学家假设地球的重心会移动。
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3. The engineer calculated the weight distribution around the hypothetical center of gravity.
工程师计算了围绕假想重心的重量分布。