单元音
长音长，短音短，不要变音

单元音
长音；注意嘴型，介于“啊”和“哦”之间；
其后常跟卷舌音，先发前音再发卷舌音

law ball
call walk
short more
war horse

单元音
长音；保持卷舌

bird girl
shirt thirty
turn nurse
sir birth

单元音
短音；卷舌

teacher leader
remember player
doctor actor
speaker perhaps

单元音
短音；不卷舌

together today
tomorrow polite
possible control
until attention