If you witness some threat or if the child feels some danger in any situation, he can press the SOS button.

如果你看到某种威胁，或者孩子在任何情况下感到危险，他可以按下紧急求助按钮。

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The SOS-campaign is a part of this.

这次行动只是其中的一部分工作。

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The crew in trouble sent out the SOS.

麻烦的组员送出求救信号。

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The SOS legal challenge centred on how those scores were worked out and the level of scrutiny they were subjected to.

BBC: Decision due on child heart surgery legal challenge

The SOS legal challenge centres around how those scores were worked out and the level of scrutiny they were subjected to.

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Coastguards in the UK acted after they picked up the SOS signal.

BBC: NEWS | UK | England | Bristol/Somerset | Stricken rowers rescued by ship