The seven " Doctor " films were developed from books produced by Ralph Thomas and directed by Betty Box .
The seven " Doctor " films were developed from the books , produced by Ralph Thomas and directed by Betty Box .
The seven " Doctor " films were developed from the books , produced by Ralph Thomas and directed by Betty Box .
解释一下这段文字: The seven " Doctor " films were developed from books produced by Ralph Thomas and directed by Betty Box . 输出: