撤军工作分两步进行。
要进行误码率的计算，需要分两步进行，即抽样和判决。
To calculate the error rate, you need two steps, namely, sampling and decision.
该方案偏差订正分两步进行：首先进行扫描偏差订正，然后进行气团偏差订正。
This scheme includes two steps of bias corrections: scan bias correction and air-mass bias correction.
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