have an opportunity to do/of doing区别

opportunity of doing sth.
opportunity for (doing) sth.
都是做某事的机会 没有区别
给几个例句：
This gave him an opportunity of collecting his thoughts.
这给了他一个机会镇定下来.
Austin viewed mistakes simply as an opportunity for learning.
奥斯汀把任何错误都看作是学习的机会
This presents both a challenge and an opportunity for us.
这是我们要面对的一场考验,但同时也是一个我们可以掌握的机会.