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Rules of the Pinyin (phonetics)<3>

4. When consonants j, q, x or y is followed by the vowel “ü” , the written form of the vowel “ü” should be simplified as “u”, but its pronunciation remains as “ü”.

To make learning more convenient for you, we will keep the vowel “ü” as it is in its written form in order to keep the difference between the vowel “ü” and “u”.