tends to become, is prone to become, easily becomes
夏は肉が悪くなりやすいから、冷蔵庫にいれておきなさい。
Meat spoils easily in the summer, so keep it in the refrigerator.
木造の建物は火事になりやすい。
Wooden buildings are prone to catching fire.
どうして子供って、病気になりやすいのかしら？
Why do children get sick so easily?
高齢者は病気になりやすい。
Elderly people are more susceptible to illness.