Modifications of engine and tractor are discussed and experimental data presented in this paper.
本文就发动机及拖拉机的改装等问题进行了探讨，并对试验结果进行了分析。
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 tractor is powered by a diesel engine.
这台曳引机是用柴油机发动的。
The tractor is powered by a diesel engine.
这台牵引机是用柴油机发起的。
The tractor is powered by a diesel engine.
这台牵引机是用柴油机发起的。
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