It's a great film and it features a Spanish actor who is going to be a world star within a year.
那是一部精彩的电影，它由一位西班牙演员主演，他一年之内就会成为国际明星。
《柯林斯英汉双解大词典》
2
The Vatican is a powerful actor in world affairs, one that can affect the likelihood of a “clash of civilisations”.
梵蒂冈在世界事务中扮演重要的角色，这个角色能够影响的可能的“文明冲突” 。
3
You also should provide a description of the actor — a couple of sentences will usually do — and, if necessary, provide real-world examples of the actor.