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Time derivative
[bh] समय अवकलन
[bn] সময় অন্তরজ
[ca] Derivada respecte del temps
[de] Zeitableitung
[es] Derivada temporal
[fa] مشتق زمانی
[fr] Vitesse d'évolution
[id] Turunan waktu
[ja] 時間微分
[ru] Производная по времени