u vs ʊ ?

Oeasy

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http://www.oxfordlearnersdiction ... onunciation_english
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ʊ        put        /pʊt/
$ q! v7 c/ C, h0 Au        actual        /ˈæktʃuəl/

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7 ^7 U! O* ~! z8 B$ B6 Y---
OED: http://public.oed.com/how-to-use-the-oed/key-to-pronunciation/
7 z2 K6 {: D4 j& ~8 u- N

CALD: http://dictionary.cambridge.org/help/phonetics.html
0 r3 d8 u/ n: P3 t) @2 o, yOther symbols
……
# Y0 Z, q) d! D2 K" t/ qu         /ˌɪn.fluˈen.zə/ influenza

MED: http://www.macmillandictionaries ... nunciation-symbols/
Pronunciation guide
Below you can find an interactive version of the well-known phonemic chart put together by author Adrian Underhill for his book Sound Foundations. The British English editions of our dictionaries use these symbols from the International Phonetic Alphabet (IPA), plus the symbols /i/, /u/ (e.g. friendly, actually) and /x/ (e.g. loch).

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0 B0 d: R3 L% Lhttp://www.macmillanenglish.com/ ... und-Foundations.htm
$ J* T5 Z% S  \# D7 X. }Sound Foundations
By Adrian Underhill  
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# ]& j9 [' n: R& n4 O/ ~+ O# a' r

Oeasy

. z% N+ i. q9 J' P4 [! x6 J0 e$ D, i+ ^有没有可靠的的资料，说明下为何OALD、MED等要在IPA外再加一个/u/。
actual        /ˈæktʃuəl/

) ?. A1 Q3 q4 G2 ~. eOED
actual http://www.oed.com/view/Entry/1972
put http://www.oed.com/view/Entry/155188

. W2 Q+ {: q1 I里面都一致/ʊ/。
7 u& e& W( \7 J; b

有意思的是，http://www.oed.com/view/Entry/95531
influenza 注音里出现了/u/，但是 Key to pronunciation （http://public.oed.com/how-to-use-the-oed/key-to-pronunciation/ ）里没提到过这个。
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Pronunciation:  Brit. /ˌɪnflʊˈɛnzə/ , U.S. /ˌɪnˌfluˈɛnzə/

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actual
/ B' O4 [/ `3 |$ s% ?  zadjective [before noun] uk   /ˈæk.tʃu.əl/ /-tju-/ /-tʃʊl/

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deeke

《Sound Foundations》这书在安卓、苹果市场里有对应软件：Sounds

dingjayi

从EPD15版起，就增加有u 和 i两个弱元音啊！就是介于长与短之间的音。