a flake of snow的用法和样例：
- Snow is made up of millions of flakes, each a Bit of water vapor that in freezing temperatures was changed into a flake of snow.
- So you treated some woman to a flake of your life.
- A flake of bone had lodged itself in his knee.
- Flakes of snow are falling onto the ground.
- Flakes of snow were falling from the sky.