a meatless day的用法和样例：
- Today， I promise at least one vegan day per week, a meatless day with no milk and no egg.
- "One meatless day a week is a great idea, and no loss for those who want a tasty diet," said languedocienne on the Guardian's environment blog.
- I bought a pair of tan leather shoes the other day.
- He has a large amount of mail to answer every day.