准备好信号设备，供急用。
Have signaling equipment ready for immediate use.
youdao
他打信号表示已准备好动身。
He signed that he was ready to start.
我们等待一帧准备好，或者等待一个中断信号。
We wait for a frame to be ready or for a signal to interrupt our wait.
应用推荐
模块上移
模块下移
不移动