1. A carboxyl group is a functional group consisting of a carbon atom bonded to an oxygen atom and also bonded to a hydrogen atom.
羧基是一种官能团，由一个与氧原子相连的碳原子，并同时与一个氢原子相连。
2. The carboxyl group is commonly found in organic compounds such as carboxylic acids.
羧基常见于有机化合物，如羧酸。
