发音
双唇向前突出
舌尖不触下齿
发长音

单词
do two who
cool fool tool
blue glue true
fruit juice suit
lose move shoe
food moon soon
group soup you
include June rule
blew drew threw
improve prove remove

句子
The boy threw the tool.
There are two blue suits.
You should put on shoes.
The moon is coming soon.
We should improve food quality.

同音
[u:]
flew flu
blew blue
few phew
root route
too two
knew new
cue queue
who’s whose
threw through
chews choose

辩音
[u:] [u]
fool full
pool pull
stewed stood
kook cook