我對於生命分子水的功用有些混亂,求解答!

As a solvent:
Water dissolves many substances and provides a medium for chemical reactions to take place.

As a medium for transport:
Water transports substances around the body.

Differences:
Water as a solvent does not include the function of transportation. It only focuses on the function of dissolving substances. For example, blood acts as a medium of transport. But usually chemical reactions are involved when water acts as a solvent.