USAGE NOTE 用法说明: actor and 和 actress
An actor can be male or female. actor 可指代男性，也可指代女性:
a group of actors 一组演员
She's wanted to be an actor since she was six. 她从六岁开始就想当演员了。
An actress is always female, although some women prefer to use the word actor about themselves. actress 总指代女性，尽管一些女演员倾向于用 actor 指代自己。