"除此之外"的英语表达是 "in addition to" 或 "besides"。
"in addition to" 来源于拉丁语，意思是"除了"。例如：
In addition to studying for the exam, I also need to finish my project.
除了复习考试，我还需要完成我的项目。
"besides" 来源于古英语，意思是 "除了" 或 "此外"。例如：
I don't pke to play soccer, besides it's too hot today.
我不喜欢踢足球，此外，今天太热了。