a black day的用法和样例：
- We know a black day when it comes.
- What a black day! I have been racing the clock since last Monday!
- Quite frankly, April 6 will be a black day for business.
- Mobutu's money to his heirs as a black day for Congo, and all of those who had fought against the release of the funds.
- Send out a black day photograph participating in 2005 Academy Awards presenting award in Beijing, look at photograph back.
- It was a black day for the aircraft workers when the government announced it was canceling its contract for a new fighter.
a black day的相关资料：