Question

下面英语语法解析 主要是to which islanders...这里看不懂 towhich是引导词？

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

Answer 1

您好，
回答如下，to which是定语从句引导词，指代先行词diseases 因为have no immunity (to …)是固定搭配，表示“对……没有免疫力”
试译：他们认为其人口增长迅速，随后保持微增减的稳定状态并一直持续到欧洲人到来之前，他们给岛上居民带来了其没有免疫力的致死性疾病。
回答完毕，希望能帮到您！