The word "Tan" is usually used to mean to talk about or discuss a topic or thing, similar to "Tan" or "Tan" in Mandarin. For example, you can say "Let's talk about this plan" to express "Let's discuss this plan".

And "speaking" is more specific, which usually refers to communicating with people through language and expressing opinions or information. For example, you can say "I want to talk now" to express "I want to talk to someone now".

Therefore, it can be said that "speaking" is a broader concept, which can cover the forms and contents of various speeches or speeches, while "speaking" is more specific and concrete, emphasizing communication with people through language.