serious D.J.['siəriəs] 这个音标有几个音节?怎么划分出来呢?

两个音节。a word or part of a word which contains one vowel sound.这里的元音是[iə]
1.元音:
1) [i:] 字母组合:ee ea e ie
three tree green sheep meet beef see seek
eat tea meat leave lead teacher team mean speak clean please
he she me
piece receive ceiling
2) 发音字母 i y e
sit picture it is list six mix fix fit pig big build miss
myth many twenty happy dictionary
defect decide delicious
3) [] 发音字母 a
bag hand and ant happy hat map mad bad black back glad flag shall man
4) [e] 字母组合 ea e a
head bread pleasure
elephant electric remember sell shell lesson better bed desk hotel yes
many any

5) [ε:] 字母组合ir ur ear er or
girl shirt skirt thirty thirteen third bird
turn burn murder nurse turtle Thursday burger
learn earn earth heard
term her nerd serve
work worm work world

6) [ε] 字母组合 er or ou ar o a e u
teacher leader remember player speaker farmer powder
doctor actor mayor author tractor
delicious gracious pleasure
familiar collar dollar
together tomorrow today shallop lesson Washington control polite
around account ago elephant manta banana Canada Japan china
men listen
famulus Saturday
7) [a:] 字母组合 ar a
car farm card arm garden
fast class last glass plant aunt calm
8) [] 发音字母 u o ou oo
up supper lunch fun gun hunt cup bus
come mother dose brother love above
trouble rough flourish
blood flood
9) []字母组合 al or au our ar
small wall talk tall hall ball call walk
short more lord horse for forty sport door floor store
author caught autumn
four mourn court bought
warm quarrel quarter
10) [] 发音字母 o a
hot lost lot fox box mop hop loss collar not
want wash watch
11) [u:] 字母组合 oo o u
food moon room gloom broom doom goose tooth
shoe do two
true truth blue full prude
12) [u] 字母组合 oo ou u o
look good foot book wood
should could
put full bull pull push
woman wolf
13) [ei] 发音字母 a ay ea ai ey
name cake late gate plane April
play say may way
great break
rain paint plain
they grey
14) [ai] 发音字母 i y
bike fine find die nine light night high
my try fly eye
15) [au] 字母组合 ou ow
house out flour ground account count sound loud around mouse
flower down now cow how town
16) [εu] 发音字母 o ow oa
home cold go no phone host ghost
know low below grow blow show flow
boat coat goal
17) [] 字母组合oy oi
boy toy joy
oil soil voice choice
18) [iε] 字母组合 eer ear
beer deer
ear near
here fierce idea
19) [] 字母组合ear air ere
pear bear
chair air fair
there where
care
20) [uε] 字母组合our ower
hour tour
flower shower

英语音节有三大类型:开音节,闭音节,r音节(很详细的介绍了：
以元音结尾的音节称为开音节,以辅音结尾的音节称为闭音节
一、音节：音节是读音的基本单位,任何单词的读音,都是分解为一个个音节朗读.在英语中元音特别响亮,一个元音可构成一个音节,一个元音和一个或几个辅音音素结合也可以构成一个音节.一般说来,元音可以构成音节,辅音不响亮,不能构成音节.但英语辅音字母中有 4 个辅音[m],[n],[ng],[l]是响音,它们和辅音音素结合,也可构成音节.它们构成的音节往往出现在词尾,一般是非重读音节.英语的词有一个音节的,两个音节的,多个音节的,一个音节叫单音节,两个音节叫双音节,三个音节以上叫多音节.如：take 拿,ta'ble 桌子,pota'to` 马铃薯,pop`ula'tion 人口,congrat`ula'tion 祝贺.tel'ecommu`nica'tion 电讯
划分音节的方法：元音是构成音节的主体,辅音是音节的分界线.两辅音之间不管有多少个元音,一般都是一个音节.如：bed 床,bet 打赌,seat 坐位,beat 毒打,beaut 极好的 beau'ty 美.两元音字母之间有一个辅音字母时,辅音字母归后一音节,如：stu'dent 学生,la'bour 劳动.有两个辅音字母时,一个辅音字母归前一音节,一个归后一音节,如：let'ter 信,win'ter 冬天.不能拆分的字母组合按字母组合划分音节.如：fa'ther 父亲,tea'cher 教师.
1）音节按读音可以分为开音节和闭音节
开音节又可以分为绝对开音节和相对开音节
(1) 绝对开音节：是指一个元音字母后面没有辅音字母而构成的音节,例如：we,hi,yo-yo
(2) 相对开音节：是指一个元音字母后面有一个辅音字母(除r)之外,最后是一个不发音的e构成的音节,如:take,make
在开音节中,这个元音字母发“字母”本身音,例如hi|hai|,use|ju:z|
(3) 闭音节：指元音字母后面有辅音字母(辅音字母r除外)构成的音节,如：leg,cross
2）音节按重读可以分为重读音节和非重读音节
重读音节：指在双音节或多音节词中有一个发音特别响亮的音节,叫重读音节,用重音符号“`”标于相应位置,其他音节为非重读音节,如begin |begin|,单音节词作重读处理,但不标重音符号.
英语语音基础知识