名词
中文翻译：信号
同义词：
['indicator', 'sign', 'indicatorial', 'signifying']
例句：
-
1.The signal from the radio was clear enough for us to hear it clearly.
收音机的信号足够清晰，我们能听清楚。
-
2.The police officer used a flashlight to signal the driver to stop.
警察用手电筒示意司机停车。
-
3. The conductor gave a sharp signal to start the train.
列车长发出一个尖锐的信号开始运行。