a tenuous hold on life的用法和样例：
- His hold on life was marvellous.
- Spitzer's ascension could weaken their already tenuous hold on the State Senate, their only redoubt of power.
- Two other councils where no party currently has overall control, Cumbria and Warwickshire, are in his sights too, as are two counties in the south-west where the Lib Dems now have a tenuous hold.
- Increasingly troubled by the meaninglessness of his experiences, he gives human motives to the inhumanity of his captors, which helps maintain his tenuous hold on the world.