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Understanding Chinese Pinyin: Omissible rules


In Chinese Pinyin system, "iou", "uei", "uen" should be written as "iu", "ui", "un" when adding initial before "iou", "uei", "uen". (Because when the final "iou", "uei", "uen" is spelled with the initial consonant, the middle vowel of "o, e" will become not obvious, omit the middle vowel of "o, e" can reflect the voice of the actual situation.)
For example:
    xiōuxiū(羞, shy; bashful)
    guěiguǐ(鬼, ghost)
    cuēncūn(村, village)

When the final "ü" or in "ü" column of finals is spelled with the initial "n" or "l", the two points() on the "ü" can not be omitted.
For example:
    (女, female); (绿, green);
    nüè(虐, crue); lüè(略, omit).
Otherwise when the final "ü" or in "ü" column of finals is spelled with other initial consonant (except n, l), the two points() on the ü must be omitted. For example:
    jǚ(举, hold up)
    jüèjuè(倔, gruff)
    qüánquán(拳, fist)
    qǘnqún(群, group).