Although agricultural production can be increased by use of machinery such as tractors and the addition of fertilizer, the land ultimately can produce only so much food and no more.
虽然使用拖拉机等机械以及施用化肥可以提高农业产量，但是土地最终所能产出的粮食只有那么多，不会再增加。
Agricultural and forestry machinery - pedestrian controlled tractors with mounted rotary cultivators, motor hoes, motor hoes with drive wheel - safety.
农业和林业机械。装有旋转式中耕机，电动锄具，带驱动轮的电动锄具的可在侧面步行操纵的拖拉机。安全性。
The analysis on models showed that newness coefficient of agricultural machinery, proportion of new and old tractors are two important factors affecting on the intact rate of large medium tractors.
由模型分析可见，农机新度系数、大中型拖拉机的新旧结构比例是影响大中型拖拉机完好率的两大重要因素。
More than one hundred modern farm tractors from nine countries were shown at Peking Foreign Agricultural Machinery Exhibition in 1978.
1978年北京外国农业机械展览会共展出九个国家近一百多台现代农用拖拉机。
More than one hundred modern farm tractors from nine countries were shown at Peking Foreign Agricultural Machinery Exhibition in 1978.
1978年北京外国农业机械展览会共展出九个国家近一百多台现代农用拖拉机。
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