They think its population grew rapidly and then remained more or less stable until the arrival of the Europeans, who introduced deadly diseases to which islanders had no immunity.

他们认为岛上的人口增长迅速，然后保持或多或少的稳定速度来增长，直到欧洲人的到来引进了岛上居民对其没有免疫力的致命疾病。

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These viruses can cause deadly diseases, like COVID-19.

这些病毒会导致致命的疾病，比如新型冠状病毒肺炎。

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Treatment of deadly diseases has improved since 1918, but so have the diseases.

从1918年以来对于致命疾病的治疗已经有了很大改善，但这种致命性的疾病仍然存在。

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