Could he not, just as a precaution, move to a place of safety?.

就算仅仅是为了以防万一，难道他就不能挪到安全的地方吗？

I had taken the precaution of doing a little research before I left London.

我已在离开伦敦前进行了准备，做了些调查研究。

Extra safety precautions are essential in homes where older people live.

在有老人的家里，采取额外的安全防范措施是绝对必要的。