重点词汇
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前奏
prelude; overture; prologue; introduction; precursor; preface
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唱歌
sing; chant; carol; vocalize; sing a song; vocal; singing; song; vocalization
Prelude hum and sing
前奏
prelude; overture; prologue; introduction; precursor; preface
唱歌
sing; chant; carol; vocalize; sing a song; vocal; singing; song; vocalization