a cup of char的用法和样例：
- Each of us partook of a cake and a cup of tea.
- Must you dash off? Why not stay for a cup of tea?
- Would you like a cup of malt whisky?
- I put her to bed with a cup of tea. She's got flu.
- I usually have a boil egg and a cup of coffee.
- I wouldn't say no to a cup of tea.