It can choose single track or doublet...

可根据实际需要选用单导轨或者双导轨。

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In all of these trials, treatment consisted of an induction phase of 4 cycles of a platinum-based doublet followed by an early switch to a different drug or to placebo.

在这三项试验中，治疗包括4个周期以铂类为基础的诱导联合方案，接着再转向其他不同的药物化疗或安慰剂对照。

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