a smooth flowing melody的用法和样例：
- There is seldom a smooth flow of traffic.
- To ensure a smooth flow of traffic at the hotel's Front Driveway.
- The ideal state is a smooth flow of materials throughout our own factory.
- Stratospheric air more stable, is a smooth flow of the atmosphere, the stratosphere is called.
- But it would be wrong to think of such a slice as moving continuously, like a smooth flow of time.