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老师 讲 课 了 .
l au̯˧˩˧ ʂ ɻ̩˥ WORD_BOUNDARY tɕ j a˧˩˧ ŋ WORD_BOUNDARY kʰ ɤ˥˩ WORD_BOUNDARY l ɤ WORD_BOUNDARY 
老 师 WORD_BOUNDARY 讲 WORD_BOUNDARY 课 WORD_BOUNDARY 了 WORD_BOUNDARY