当旅游受到限制后，从大陆迁移过来的居民的捕鱼活动又成了主要威胁。
When tourism was more limited, fishing by settlers from the mainland was the main threat.
我们眼中看到的人种差异，例如欧洲人与非洲人的差异，主要是人类从一个大陆向另一个大陆迁移时为适应气候所产生的。
What the eye sees as racial differences - between Europeans and Africans, for example - are mainly a way to adapt to climate as humans move from one continent to another.
尽管大陆北部允许更多样化的经济存在，一些早期的人类群体很快向南迁移。
Even though the northern part of the continent allowed for a more varied economy, several early human groups quickly moved south.
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