Loggers relied on axes, handsaws and draft animals before the advent of steam engines and gas-powered vehicles, along with chainsaws and harvesting machines such as the feller-buncher.

在蒸汽机、蒸汽动力机车、电锯和伐木归堆机等工具问世之前，伐木工人依靠斧头、手锯和驮畜进行作业。

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Tractors freed acres of land for production that heretofore had been used only to feed draft animals.

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The replacement of draft animals by machines released about 25% more land for growing food for human consumption.

ECONOMIST: The story of man's staple food

The advent of tractors, for example, freed millions of acres that previously had to be used to support draft animals.

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