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ordinary differential equation is obtained only one independent variable and partial differential equation is obtained more than one variable.
Philipp von Jolly invented the modern weighing scale in 1874.
Weighing scale is called "秤" (chéng) in Chinese.
once upon of the time
The name of the creator of the first weighing scale is lost in antiquity. The most ancient relics of a weighing scale date back to around 2,000 B.C.