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线有长度，但既没有宽度，也没有厚度。
A line has length but neither breadth nor thickness.
youdao
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并利用特征线法，得到薄膜厚度的方程。
The equation for thickness of film was obtained by the method of characteristics.
youdao
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并利用特征线法，得到薄膜厚度的方程。
The equation for thickness of film was obtained by the method of characteristics.
youdao