If it were a race, then United are dragging their owners behind them like a tractor, while City's owners are providing rocket fuel.

如果这是场拉力赛的话，那曼联就像拖拉机，后面还拽着司机，看看曼城吧，人家司机提供的可是火箭燃料。

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Bathed in xenon spotlights, the white spaceship, attached to its twin solid rocket boosters and orange external fuel tank, crept 3.4 miles on the back of an enormous tractor called the Crawler.

沐浴着氙气聚光灯光，白色的飞船，带着一对固体火箭推进器和橙色外挂燃料箱，在称为“爬行者”的巨大拖拉机上缓慢行驶了3.4英里。

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In this paper, fuel consumption model of diesel engine for tractor is developed based on statistical analysis for a lot of test data to predict fuel economics of tractor.

本文通过对大量发动机性能试验数据的分析和统计，提出了一种比较简单实用的预测拖拉机柴油机燃料经济性的效学模型。

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So, what are the economics of converting fertilizer and tractor fuel into automobile fuel?

FORBES: Moonshine on Capitol Hill

The technology isn't new-a patent for a hydrogen internal combustion engine was issued in 1928, and a 20hp fuel-cell tractor was demonstrated in the late 1950s.

FORBES: Magazine Article

Fewer herbicide applications mean fewer tractor trips across the field, less fuel consumed and lower overall carbon emissions.

FORBES: Commentary