This is the 64th most frequent Chinese word.
两
"两" means "two" or "both" and is also a measure word for some units in Chinese.
The word 两 is used to indicate the quantity of two in this sentence.
我买了两本书。
I bought two books.
The word 两 is specifying the count of birds in this description.
公园里有两只小鸟。
There are two small birds in the park.
The word 两 is part of the time expression indicating two o’clock in this context.