Now I don't know why that's the case, but my guess is that that's because when you learn a language as an adult, you almost invariably learn it through your native language, or through your first language.
现在我不知道为什么是这样的， 但是我猜测那是因为 当你作为成年人学习语言的时候， 你几乎总是在 通过你的母语或者通过你的第一语言在学习它。