为了实现这个策略，简单地将所有的读操作传递到源，并返回结果。
For this policy, all read operations are simply passed on to the sources, and results are returned.
它们能直接并快速地“读”出dna，同时足够廉价以便进行大量的重复实验。
They can "read" DNA directly and rapidly, and are cheap enough to replicate in vast Numbers.
为了得知外设是否就绪，CPU必须不停地轮询接口(读状态寄存器)并最终锁存数据。
In order to know this, the CPU must be continually 'polling' the interface (reading the status register), and finally latched the data.
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