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阅读下面短文,根据短文内容回答问题。Sunscreen (防晒霜) protects our skin from sunburn. But did you know that it is harmful to coral (珊瑚) living in the ocean? Some chemicals in sunscreen, such as benzophenone (二苯甲酮), can kill coral. Every year, about 4,000 to 6,000 tons of sunscreen flows into coral areas, according to the US National Park Service. About four years ago, Zhang Baoxin, who studied at Guangdong Experimental High School, read about this and decided to make an environmentally friendly sunscreen to protect the marine (海洋的) environment. Zhang read lots of things about it and then put forward a new formula (配方). She mixed natural plant oils with safe and commonly used sunscreen ingredients. She tested about 10 kinds of plant oils and after trying about 20 formulas, Zhang found a jojoba oil formula that is effective, cheap and easy to make. Zhang wrote a paper to explain her findings. The project made Zhang a nominee (候选人) of the Stockholm Junior Water Prize, an award to celebrate teenagers who help solve major water challenges. She was the only nominee from the Chinese mainland in 2020. "With my formula, anyone can make sunscreen at home. You just need a blender to mix the oil and the powder," she said. She wants to study environmental science in college. "I hope to use my knowledge to make a better world. " she said.
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