老年人对流感病毒的易感性更高。
Elderly people have a greater ___susceptibility to the flu virus.
老年人对感冒病毒更敏感。
The elderly have higher ___susceptibilities to cold viruses.
他情感脆弱，对悲伤的故事特别敏感。
His emotional ___susceptibility makes him particularly sensitive to sad stories.
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