any nonverbal action or gesture that encodes a message
any incitement to action
an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
例句
例句
In digital signal technique, a signal that uses a positive(or negative) excursion and ground as the two binary signal states. 在数字信号技术中,用正(或负)向电压与地两个电平来表示二进制“1”和“0”的一种信号
A police car drew alongside and signalled to me to stop. 一辆警车开到我身边示意我停下来。
The defeat signalled the end of the war. 那一次失败标志着战争的结束。
Heavy footsteps signalled the teacher's approach. 沉重的脚步声显示教师已经走近了。