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This modification is not only an optimum program but also a design for mechanical models.
这一“修改”既是数学上的优化问题又是工程设计问题。
youdao
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Like many boys of today he made mechanical devices and models.
他和现在的许多孩子们一样，制作机械装置和模型。
youdao
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Like many boys of today he made mechanical devices and models.
他和现在的许多孩子们一样，制作机械装置和模型。
youdao