The phase error estimation part utilize one pilot tone to track the phase error and uses the estimation after compensation structure to improve precision.

残留相偏估计部分采用利用导频进行相偏跟踪的方法，并采用补偿后估计的结构来增加估计的精度。

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In pilot research, researchers found that tone of voice, time of day, and the speaker's gender were irrelevant. In the new study they used clear, calm voices.

在先导性研究中，研究人员发现提问时的语气、时间和提问者的性别都无关紧要。在新研究中，他们用了清晰、平静的声音。

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Pilot studies had shown that what might seem an obvious fourth procedure, to tone down, rather than enhance feather colour, was too damaging to work.

ECONOMIST: Male birds cannot afford to relax their standards

"Revolutions" does find, however briefly, a desperately needed change of tone in the heartfelt heroics of Jada Pinkett Smith's Niobe, a courageous pilot who is joined on an ostensibly doomed mission by Laurence Fishburne's stalwart Morpheus.

WSJ: Big Glitch in the Matrix