曲线，且斜率是2倍的关系，既的英文

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• 曲线:    curve; curved line
• 且:    just; for the time ...
• 斜率:    gradient; rake rat ...
• 是:    Semantics
• 倍:    times
• 的:    4次方是 The fourth po ...
• 关系:    relation; filiatio ...
• 既:    already