There are now homes, factories and farms on land that once was forest.
曾经是森林的土地上现在都是住宅、工厂和农场。
On farms and in factories, they help to do difficult work.
在农场、工厂里它们帮助完成困难的工作。
On farms and in factories, they help to do difficult work.
在农场、工厂，它们帮做困难的工作。
On farms and in factories, they help to do difficult work.
在农场、工厂，它们帮做困难的工作。
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