[From wiki answer]:一句话, 如果首字母u的发音像yoo而非ʌ那么就应该视为辅音而非元音.
An unique, an university, an European, etc are desperately pedantic.
No, it’s “a unique”. Here is a good explanation I found whilst “googling”:
“When a “u” word is pronounced as though it begins with a “y” (yoo nique), it’s treated more like the consonant sound of the y. So, a university, an umbrella, a usual day, an unusual day.” When you google it, you get about 78,700,000 matches.