Carl, who now holds an important position in a large chemical works, still remembers one afternoon in his first year when the professor took the students to the chemistry lab.

• 卡尔现在在一家大化工厂里担任重要任务,但至今仍然记得他在一年级时教授把他们这些学生带到实验室去的那个下午。句,整个句子的意思仍然完整。