Powerfail: Only execute the command if init receives a power fail signal.

powerfail：只在init收到电源故障信号时执行命令。

youdao

Powerwait: Only execute the command if init receives a power fail signal, and wait until the process terminates before continuing to scan the inittab file.

powerwait：只在init收到电源故障信号时执行命令，并且等待进程终止后再继续扫描inittab文件。

youdao

Their silent suffering must serve as a warning signal of the greater suffering that lies in store for the rest of us if we fail to tackle climate change together.

如果我们不能共同应对气候变化，那么，他们默默忍受的痛苦必定成为一个警告，暗示更大的痛苦正等待着我们其他人。

youdao

Going wireless risked security and production troubles: People might toss them onto the field or the wireless signal might fail.

WSJ: Menu

But they say it's also a signal that Israel could act militarily if all diplomatic efforts fail.

NPR: Israel, Iran and the Nuclear Question

However, GPS signals can fail or be fooled by a conflicting radio signal, said Professor David Last, an advisor to the to General Lighthouse Authority.

BBC: Navigational backup to aid ships in Dover straits