This system is SAFE for your vehicle and requires no engine modifications .
该系统是安全的，不需要你的车发动机的修改。
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。
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。
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