He used a version of the frequency trick.
他使用了出现频率轨迹的另一个版本。
In other words, in what frequency is the use case used within the system?
换句话说，用例以何种频率在系统中使用？
Baseband is a network technology in which only one carrier frequency is used.
基带是一种网络技术，其中只有一个载波频率的使用。
Variable speed constant frequency generating system has been used in modern aircraft.
变速恒频电源系统已在现代飞机上使用。
Therefore the low frequency of original record can only be used for dynamic analysis.
因此可以只把原始纪录的低频部分用于动力学分析。
Therefore the low frequency of original record can only be used for dynamic analysis.
因此可以只把原始纪录的低频部分用于动力学分析。
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