固定用的缆索，像吉他弦一样，在水流中会振荡出声。
And mooring cables would thrum in the currents, like a guitar string.
固定频率源可以在在通讯系统和雷达系统中作为本机振荡器，也可以作为数字电路的基准时钟信号，因此得到了广泛的应用。
Single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.
电场和磁场是由振波以固定频率振荡而形成的。
The electric and magnetic fields are formed due to a passing wave oscillating at a regular frequency.
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