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。

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.

youdao

同样，人们对其没有免疫力。

Nobody had immunity to it either.

youdao

居民对探险者携带的病毒没有免疫力，很快就死去了。

The island's inhabitants had no immunity to the diseases carried by the explorers and quickly succumbed.

youdao

You don't have it, you don't have any immunity to smallpox, you don't have any reason to immunity to smallpox.

你们对天花没有任何免疫力,你没有任何理由能对天花免疫

耶鲁公开课 - 生物医学工程探索课程节选