The first series (originating from OneRepeat) contains just one value {a}.
第一个序列(源自onerepeat)只包含一个值{a}。
The labor song is the oldest ballad directly originating from physical labor.
劳动歌是由体力劳动直接激发起来的最古老的歌谣。
The labor song is the oldest ballad directly originating from physical labor.
劳动歌是由体力劳动直接激发起来的最古老的歌谣。
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