Which way is better for running memcached?

[Jm lists]

>
> The second way is almost certainly better because you will be able to
> bundle more keys together in a "get" request when you want multiple
> pieces of data. Requesting two keys in one "get" request is *much* more
> efficient than requesting one key in each of two requests.

Steve,sorry I can't understand the words above.
Can you kindly help give a more detailed description?
Thanks again.