a tenable theory的用法和样例：
- a tenable theory.
- This is a tenable approach and will do us much good.
- Semantic paradox is not a tenable proposition, no m atter its hypothesis is true or not, from this point of view, it can be called " neutral proposition".
- The lectureship is tenable for a period of three years.
- Einstein's theory marked a new epoch in physics.