出responsible的名词形式

　　He finally handed over his responsibility for the company last year.

　　他终于在去年交出了公司的职务。

　　That's too much responsibility for a child.

　　对于一个孩子来说，这责任是太重了。

　　She feels a strong sense of responsibility towards her employees.

　　她对雇员有很强的责任感。