1.  signal
2.  sign
3.  semaphore
4.  call letter

• 1. 信号: signal | semaphores | TTL | RTS | signal
• 2. 信号处理: signal processing | Image video audio and speech processing | signal | signal handling
• 3. 数字信号处理: Digital Signal Processing | DSP | DSP Blocks | Oppenheim & Schafer

更多释义

• 1.他们发射了3次遇难求救信号。
  They fired three distress signals.
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• 2.传感器沿光导纤维输送光信号。
  A sensor channels the light signal along an optical fibre.
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• 3.信号灯故障导致了这次撞车事故。
  A signal failure contributed to the crash.
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