The cut-off spatial frequency is got higher at the cost of the loss of mid-spatial frequency, and the information got by the system are different in all directions.

合成孔径成像系统在获得高截止频率的同时，降低了系统的中频性能，并且合成孔径成像系统的信息获取在方向上具有可选择性。

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The results show that there exist attenuation in all propagation modes along viscoelastic cylindrical tube, and higher-order propagation modes haven't cut-off frequency.

分析结果表明与弹性圆柱管相比粘弹性圆柱管中轴对称波的各阶传播模式均存在衰减，高阶传播模式并无严格意义的截止频率。

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And in the talk program, only cut-off and sound stretches appear. The frequency of the formal is much higher than that of the latter.

在这个谈话节目里只出现了突然停止和拖长音节的非词汇手段，而且前者的频率远远的高于后者。

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