adultness

例句：

1. 1. The man is in his mid-forties and has a lot of experience.
   这个男人四十多岁，经验丰富。
2. 2.She is an expert in her field and has been working for many years.
   她在自己的领域里是个专家，工作了很多年。
3. 3. As an adult, I have learned to be more responsible and considerate of others.
   作为一个成年人，我已经学会了更加负责任和考虑他人的感受。