tea
1.tea统指“茶”，a tea是“一种茶”，teas是“多种茶”。
2.“红茶”是black tea。
3.tea统指“茶点”，a tea是“一次茶点”、“一客茶点”或“一客茶”，teas是“多次茶点”、“多客茶点”或“多客茶”。例如：
- I should like to have some cake for tea.
- We had a tea together.
- I should like to have a good tea.
- There were dances and teas.
- Teas provided.
- Two teas and two coffees, please.
4.She insisted on my eating some tea里的eating some tea是“吃些茶点”。
5.关于a cup of tea，参见glass 2
