signalsig•nal /'sɪɡn(ə)l/

n C

1. 信号；暗号

• a danger signal 危险信号

• We are waiting for him to give a signal. 我们等待他给出信号。

2. 标志，表示

• His speech was a clear signal that he would change the current policy. 他的演讲明确表明他将改变现行的政策。

3. 【电子】 (电子脉冲或无线电波的)信号

• It's an area with a poor mobile signal. 这个地区移动电话的接收信号不佳。

4. 【铁】 信号机

• a railroad crossing signal 铁路道口信号机