一次变换 meaning in Chinese

linear transformation

Was this another flip - flop from a man who has developed a reputation for confusing financial markets by sounding alternately hawkish and dovish
难道这是一个已经建立名声的人再一次变换立场，为的是通过鹰派（激进）和鸽派（保守）两种作风相交替来干预金融市场？
The two reporters agreed to switch roles for once and be the interviewees rather than the interviewers in order to let us know about their work and how the news we read is made
这两位记者同意就这一次变换角色，做被采访者，而不是采访者，以便让我们了解他们的工作了解我们见到的新闻是怎样制作出来的。
The research includes : the preprocssing of sensor signal , the normalization and compression , signal transferences in the first and second phases , which ensured an in - depth study of circuit designing for the lowpass wave filter , the digital - analog converter , the voltage controlled oscillator under the comparatively ideal linearity
我所做的具体工作包括：传感器信号的前置处理、归一化变换及压缩、信号的一次变换和信号的二次变换。较为深入的研究了低通滤波器的设计和数?模转换器、压控振荡器在较好线性下的电路设计。