Yang Ping asked, "What experiment does he need to use toluene for?"
Li Xiong shook his head, "He didn't say, he just mentioned he needed it, so I helped him buy it. He didn't allow me to ask about the specifics of the experiment, and I didn't ask further."
Yang Ping asked again, "After using the two bottles of toluene, where are the bottles?"
Li Xiong thought for a moment and said, "They should be in the drawer of his laboratory bench; he has a habit of keeping empty bottles after use, saying they might be useful later."
Yang Ping walked to the lab bench and opened the drawer. Inside were several empty reagent bottles, all brown glass vessels of varying sizes. Yang Ping took them out one by one and placed them on the surface. Zhaxi leaned over to look; the labels read: Toluene, analytical grade, 500ml, batch number... There were two bottles in total, both toluene.
