Both are necessary and should complement each other.
两者都是必需的，它们之间应该是相互补充的关系。
Hence, both of them should closely coordinate and complement each other.
因此，它们两者应紧密协调相互补充。
They are both very quick, and complement each other very well.
他们都非常快，并且互补性很好。
They are both very quick, and complement each other very well.
他们都非常快，并且互补性很好。
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