A form of frequency modulation in which the carrier frequency is shifted between a markfrequency and a space frequency in response to the impressed intelligence signal (frequency-shift keying).
频率调制的一种方式，其中载波频率在标志频率和场频率之间移动，以响应外加的情报(数据)信号。
2
During the intervening three years, Hong Hao has become fascinated with openings, the ritual gatherings that mark the calendars of museums and art galleries with increasing frequency.
It can be proved that except is its basic semantics by mark theory and pragmatic frequency. The other meanings are generated by adding some mark words.