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As a child, I would get extremely excited whenever I came across that vehicle covered in green paint, with four wheels and smoke coming from it. I would run after it desperately, breathing in its pleasant scent until I was completely exhausted; only then would I stop, watching as it disappeared into the dust. Later, I got to know that vehicle through pictures and stories about Uncle Lei Feng. As time passed, many things from my memory faded away, but what remained was that delightful, cheerful scent, filled with curiosity and mystery. It was an indescribable feeling, an unforgettable pleasure. In the blink of an eye, several years passed, and those vehicles gradually faded from our sight, sinking deeper into memory. The old Liberation trucks disappeared, and the Dongfeng trucks arrived, bringing with them a new kind of beauty. Whether it was the old Liberation trucks or the Dongfeng trucks, the scent remained the same – unforgettable, pleasing to smell, with a delicate aroma that was truly refreshing. Every time, I would close my eyes and take a deep breath, longing for that scent to take me back to those wonderful days of my childhood… Years later, that boy who used to chase after those vehicles grew up. With the memories and curiosity from his childhood, he stepped into the world of chemistry. Chemistry once again allowed him to experience that scent from his childhood. The things from memory are always so beautiful, even though they can also bring harm