"Actually" 和 "In fact" 都是表达事实真实性的词汇，但它们之间有一些用法区别。

"Actually" 通常用于强调真实性或证明事实的真实性，用于提供新的信息或更正一个错误的认识，或者用于强调之前的陈述是正确的。例如：I thought I was going to hate the movie, but actually, it turned out to be really good.He's not my boss, actually, but rather my colleague.而 "In fact" 通常用于表示一个陈述是真实的事实，可以用于为之前的陈述提供支持，加强它的真实性，或者用于引出证据、数据等支持陈述的认知。例如：I thought I had plenty of time to finish the project, but in fact, the deadline is tomorrow.Dogs are not just amusing pets; in fact, they can be trained to assist people with disabilities.总之，"actually" 和 "in fact" 都意味着事实是真实的，但它们的使用有微妙的差异，需要根据语境区分使用。