发音
舌身平放
口半开半闭
发长音

单词
bird girl sir
her verb were
early earth learn
word work world
return turn urban
certify herb merge
birthday circle shirt
concern nerve perfect
Thursday surface burn
Journalist journey entrepreneur

句子
Please turn around.
The circle is perfect.
Thursday is my best day.
He returned home earlier.
The girl is looking at the bird.

同音
fir fur
per purr
serf surf
earn urn
tern turn
birth berth
hertz hurts
heard herd

辨音
[ə:] [eə]
fur fair
her hair
heard haired
purr pair
stir stare
were wear

[ə:] [a:]
fir far
firm farm
first fast
stir star
birth bath
curd card
hurt heart
heard hard