- They are disc instability model, starburst model and microlensing model.
- The stability of cracky roof system is analyzed by catastrophic theory and its instability model belongs to cusp catastrophic model of catastrophic theory.
- Low and intermediate frequency instability models are taken up first.
- Standing by him was a model worker.
- I think I can get that special model for you.
- She has been held up as a model worker.