free radical substitution

例句：

1. 1. Free radical substitution is a key process in the production of plastics.
   自由自由基替代是生产塑料的关键过程。
2. 2. The new drug has been shown to have a free radical substitution effect on cancer cells.
   新药已被证明对癌细胞具有自由自由基替代效应。
3. 3. In recent years, scientists have been exploring ways to reduce the use of free radical substitution in foodprocessing.
   近年来，科学家们一直在探索减少食品加工中自由自由基替代使用的方法。