老年人对感冒病毒更敏感。

The elderly have higher ___susceptibilities to cold viruses.

她小心翼翼地避开那个话题，因为知道这触及了他的情感敏感点。

She carefully avoided that topic, knowing it touched on his ___susceptibilities.

这项研究重点关注儿童对过敏的易感性。

The study focuses on children's ___susceptibilities to allergies.