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1. The engineer used a differential equation to describe the motion of the car.
工程师使用一个微分方程来描述汽车的运动。
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2. The scientist solved the differential equation using numerical methods.
科学家使用数值方法解这个微分方程。
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3. The mathematician applied the method of Laplace's equations to solve the problem.
数学家应用拉普拉斯方程的方法来解决这个问题。