How is the phonetic symbol of u written?

The pronunciation of u is [u:], [? ]、[? ]、[? ]。

Stress syllable pronunciation, open syllable reading [ju:]; In the first syllable, after the consonants J, L, R and S, read [u:].

In stressed closed syllables:

1、[? ], for example: bus, 2, [? ], for example: put.

In unstressed syllables:

1、[? ], such as arrival, 2, [home], such as occupation, 3, [? ], after the letters l, r, j, for example, musical instruments.

u:

U is an English letter, which evolved from V and is 2 1 in Latin letters. Before the19th century, U and V were always mixed indiscriminately, and later Pierre de la Ramée separated U from uppercase and lowercase letters.

For hundreds of years before19th century, these two letters, like I and J, have always been interchangeable and have never been distinguished in English dictionaries.

For example, books published in 16 and 17 centuries are usually spelled upon, while have is usually spelled haue. Even in 1847, the English dictionary published by Henry washburne Company in London still followed this convention.