a mountain spring的用法和样例：
- Its sound is sweet as a good gelato, harmonically very rich, especially in the highs, clean and pure like a mountain spring in the Italian Alps.
- There is a mountain spring near Shui 'Lian'Dong or Water Curtain Cave halfway up Moxing Peak. Known as the Nine Dragon Spring, it is a source of crystal-clear, sweet-flavoured water.
- He was pretending to climb a mountain.
- The next day we came to a mountain village.
- He's a mountain climber. he needs good boots.
- I have a mountain of work to do.