knock into, break down, in other words, devote to, rely on
1. When experiments are to be made,one cannot the human senses too much to make accurate observation.
2. When you play football,it's dangerous to players and fall down.
3. Old fashioned phones matter when wireless networks in disasters.
4. I don't think we shouldany more time this question.
It wastes our time and energy.
5. Marty's disability is "one in a million". , there are not many people in the world like him.