亚甲基

例句：

1. 1.The reaction mechanism of the compound involves the formation of a new bond between two carbon atoms through the addition of a methyl group.
   该化合物的反应机制涉及通过添加一个甲基基团在两个碳原子之间形成新的键。
2. 2. In organic chemistry, methylene groups are often found in the side chains of hydrocarbons.
   在有机化学中，亚甲基经常出现在烃的侧链中。
3. 3. The structure of this compound is characterized by the presence of multiple methylenebridges, which contribute to its unique properties.
   这种化合物的结构特征在于存在多个亚甲基桥，这有助于它的独特性质。