a two-stage process的用法和样例：
- A two stage growth process for metastable pits was suggested.
- Acrylate, DDBSA and DMF were used to react under a two stage.
- In order to reduce the investment, running cost and generation amount of AOX, a two stage short sequence process has been developed on the basis of multistage bleaching.
- The lost weight and DTG peak point of the two stage processes changed with the different proportions of TEGDN and NG.
- A two stage radiant cooler applied in compound-refrigerating system(CRS) was developed.