•[+ speech] Power grows from the barrel of a gun, opined Mao Tse-tung.毛泽东说： 枪杆子里面出政权。

•[+ that] Ernest Rutherford opined that his work on radioactive substances would be of little or no practical use.欧内斯特‧卢瑟福认为，他对放射性物质的研究工作没有多少或者没有实际用处。