[ə:] 这个音标的发音单词有?

[ə:] 这个音标的发音单词有?
[ə:] 这个音标的发音单词有?

[ə:] 这个音标的发音单词有?
[ə:]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