a pair of binoculars的用法和样例：
- Then get a pair of binoculars and a notebook.
- I sat down by the lake armed with a pair of binoculars.
- She always watches the passers-by with a pair of binoculars.
- I bought a pair of tan leather shoes the other day.
- A pair of binoculars was handed to me, and I was told to look through them.