activity and characterization的用法和样例：
- He was very active and rode down several horses.
- Enterpise activity and macro-management.
- Synthesis and Characterization of Bridged Bimetallic Complexes.I.
Copper(II) Complexes with Conjugated Diimine Ligands 王文竹;
- Monitors sales activity and employee productivity.
- Preliminary Study on Ion Beam Mutation Selection of A Yeast Strain with Esterase Activity and Characterization of the Enzymes