实际上，尽管抗氧化剂同游离基之间会产生反应且能中和自由基，也可以阻止其产生损害，但几乎没有证据证明抗氧化剂能阻止癌症。
In reality, although antioxidants interact with and neutralize free radicals and prevent them from causing damage, there is little available evidence that antioxidants prevent cancer.
加入防老剂能有效的阻止断链降解反应。
Chain degradation reaction can be prevented effectively while adding antiager.
绿色化学是一门从源头上阻止污染的化学，近年来这方面的研究主要是围绕化学反应、原料、催化剂、溶剂和产品的绿色化开展的。
The recent research and development in the field are mainly including the greening of chemical reaction, feedstocks and starting materials, catalysts, solvents and products.
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