Terms containing non- return-to-zero code

Subject	English	Chinese
telecom.	modified non-return-to-zero level code	改进的电平非归零码
tech.	non-return-to-zero code	非归零码
el.	non-return-to-zero information code	不归零信息码
space	non-return-to-zero mark code	不归零传号码
el.	pulse code modulation/non-return-to-zero	脉码调制/不归零信号变换