以此交换食物！
The country provides oil in exchange for food.
该国用石油换取食品。
The workers were given food and shelter in exchange for their labor.
这些工人用劳力换取食物与住宿。
They were given food and shelter in exchange for work.
他们用劳动换取食物和栖身之处。
The forests provided much food for the native people in exchange;
作为交换，森林为本地土著提供了许多食物；
The forests provided much food for the native people in exchange;
作为交换，森林为本地土著提供了许多食物；
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