及物动词
1. A period signals the end of a sentence.
句号表示一个句子结束了。
不及物动词
1. The teacher signalled to the boy to begin.
老师向那个男孩做手势，叫他开始。
名词
1. A red lamp is used as a danger signal.
红灯用作危险信号。
2. The railway signal showed that the train could pass.
铁路的信号标志显示火车可以通过。
1. 符号：传播的来源与日地分别是独特的个体,各有其经验范围:双方经验中交集的部分,即为讯息(message)基本来源的符号(signal). 传播双方则各自是编码、释码,与解码的系统;双方透过回馈控制过程,讯息得以了解及传布. 自施兰姆引进新的传播理论之后,
2. signal：sgl; 信号
3. signal：sig; 声音信号
noun
1. any nonverbal action or gesture that encodes a message
e.g. signals from the boat suddenly stopped
2. any incitement to action
e.g. he awaited the signal to start
the victory was a signal for wild celebration
3. an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes