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1.Copper kills many germs on contact. Now it is back in hospitals to do just that.
on contact 接触
This food will deteriorate rapidly on contact with air.
这种食物一接触到空气即迅速变坏。
The label sticks on contact , ie when it touches a surface.
这标签一接触即可贴上。
2.Copper ions do this by interacting with oxygen and changing the oxygen molecules.
interact with 与…相互作用；与…相互影响：
These two chemicals interact with each other at a certain temperature.
这两种化学物质在一定的温度下相互作用。
Atoms within the fluid interact with the minerals that form the grains.
液体中的原子与形成颗粒的矿物质相互作用。
