active bubble generator的用法和样例：
- The bubble generator is the key equipment of microbubble floatation.
- A visual prototype of bubble generator has been designed, and its numeral simulation analysis was done.
- The electric current passing through the conductor on the film of bubble generates a local magnetic field gradient to make the bubble propagate.
- This paper reveals the relationship between the operations of float glass and the size, location, composition and mechanism of bubble generation.