Gong Tingxian

例句：

1. 1. The company's official seal is displayed on all official documents.
   公司的官方印章印在所有官方文件上。
2. 2.The stamp of approval has been placed on the project.
   项目已经盖上了批准的印章。
3. 3. The seal of the government office was used to authenticate the document.
   政府办公室的印章被用来验证文件的真实性。