And, the bottom line in modeling is make it only as complex as you need to.

模型构造的底线是,根据你的需要尽量把它弄得复杂。

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Then we can take this and turn it into something a lot more complex with -singing a lot of lines going their own way.

接下来我们可以,弄得更复杂一些,同时让许多乐句单独进行

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