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This is called a covariant return type.
这就是所谓的协变返回类型的方法。
youdao
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The covariant equation of plane motion body in curved space-time is studied.
研究弯曲时空中平面运动刚体的动力学协变方程。
youdao
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The covariant equation of plane motion body in curved space-time is studied.
研究弯曲时空中平面运动刚体的动力学协变方程。
youdao