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1.The new tractor-trailer is designed to improve the efficiency of agricultural machinery.
新型拖拉机-拖车设计用于提高农业机械的效率。
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2. The tractor-trailer has been upgraded with a new engine that provides better traction and fuel efficiency.
拖拉机-拖车已经升级了一个新的发动机，提供更好的牵引力和燃油效率。
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3.The tractor-trailer's improved traction system allows for smoother driving and reduced wear on the tires.
拖拉机-拖车的改进牵引系统使驾驶更加平稳，减少了轮胎的磨损。