a pinpoint of disappointment的用法和样例：
- They were strangers sharing a pinpoint of time together.
- I looked down the hole until I saw a pinpoint of light where the cupboards had left the earth on the other side.
- A look of disappointment passed over his face.
- Its night - vision camera was focused on a pinpoint of light in the distance,a three?storey hotel building,where it detected a great deal of movement.