active methylene group

例句：

1. 1.The active methylene group is a key intermediate in the synthesis of organic compounds.
   活性亚甲基团是有机化合物合成的关键中间体。
2. 2.The active methylene group plays a crucial role in the metabolism of glucose.
   活性亚甲基团在葡萄糖代谢中起着至关重要的作用。
3. 3.The active methylene group can be used to modify the properties of polymers.
   活性亚甲基团可以用来改变聚合物的性质。