求翻譯：very intangible than um, especially if you're teaching in England and most of the students know quite a lot of English before they arrive. They learn a lot of English outside the classroom, in pubs or coffee shops or other places, with the families they're living with. It's very difficult to pin down how much they lear是什么意思？

待解決 懸賞分：1 - 離問題結(jié)束還有