About 500 years ago, two Polynesian societies vanished because they depended for vital imports on the Polynesian society of Mangareva Island, which collapsed from deforestation.
大约500年前，二个玻利尼西亚人社会消失了，因为他们极度依赖的进口国Mangareva海岛的波利尼西亚人社会的崩溃是从砍伐森林开始。
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