So we've got four chords operating here and they're changing regularly.
这一段作曲家一共调用4个不同的和弦,它们不断有规则地改变。
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We need to change our rules just slightly.
我们需要稍稍改变我们的规则。
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It was regular and it happened to involve four chords.
这是规则的,一共四组和弦发生了规则的改变。
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