Pictured is a 1917 Case traction engine, which was the world's first tractor model.
图为1917年为例牵引引擎，这是世界上第一个拖拉机模型。
The author has put forward a mathematical model of kinematics for tractor gearbox.
本文提出了变速箱运动学的数学模型。
The author has put forward a mathematical model of kinematics for tractor gearbox.
本文提出了变速箱运动学的数学模型。
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