mean [mi:n]

以下由轻松背单词网站提供

vt.意指；指示；vi.用意；adj.平均的；卑鄙的；

to express or represent something such as an idea , thought , or fact

What do you mean by opening my letters? 你打开我的信用意何在？
It does mean you have learned something. 它意味着你学有所成。