Language Point 9

As our classes were very large, I was only able to answer a couple of questions in each class period. (Para.4)
Meaning: Because there were many students in our classes, I could only answer two or three questions in each class period.
a couple of: two or three
I saw a couple of children playing in the garden. 我看见两三个孩子在花园里玩耍。
Could you please lend me a couple of dollars? 你能借我两三元美元吗?
比较: a pair of: a pair of earrings, a pair of shoes, a pair of gloves, a pair of socks