When these extractive industries declined, many people were left without supplemental income or were forced onto marginal subsistence farms in order to survive.
当这些天然的生产业衰退后，许多人失去了收入来源或被迫耕种少量的土地以求生存。
Rwanda's dependence on traditional subsistence farming meant that the only way to grow more food was to move onto ever more marginal land.
卢旺达是依赖于传统的只能维持生计的农业，从而意味着增加粮食生产的唯一途径就是把更多贫瘠的土地都开发出来。
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