bird [bɜːd]
burst [bɜːst]
dirt [dɜːt]
earth [ɜːθ]
firm [fɜːm]
nurse [nɜːs]
serve [sɜːv]
stir [stɜːr]
work [wɜːk]
refer [rɪˈfɜː]
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bird [bɜːd]
burst [bɜːst]
dirt [dɜːt]
earth [ɜːθ]
firm [fɜːm]
nurse [nɜːs]
serve [sɜːv]
stir [stɜːr]
work [wɜːk]
refer [rɪˈfɜː]
查看更多
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