<漢語拼音>
I didn't believe my mum when she proudly told me that recently. So she called 慧 over to give me a "live" demo over the phone, asking her the difference between the "u" and "ü" sounds. Here's my niece's reply:
“U有兩個dot的是“wu”,U沒有兩個dot的是“yiu”。”
45 days to go.