subject of numerous patents

例句：

1. 1. The teacher asked thestudents to present their research on the environment.
   老师要求学生们展示他们对环境的研究。
2. 2. Thebook is about the history of the UnitedStates.
   这本书是关于美国历史的。
3. 3. The student's presentation was well-receivedby the audience.
   学生的演讲受到了听众的热烈欢迎。