First of all, don't come in here without a teacher.
首先,没有老师领着不要进这儿。
That's easier said than done!
说来容易做起来难哪!
My dear friend, Mathilde. Let me tell you something. That necklace you borrowed from me wasn't a real diamond necklace. It wasn't valuable at all. The stones in the necklace were made of glass. It was worth five hundred francs at the most.