Yes. I don't think it's necessary to buy the bigger one.
有哇。我认为没必要买较大的机子。
That's why you need the lab.
这就是你为什么要用实验室的原因。
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.