Get EntitySet with two association

Hi all,

I have an entityset  'MessageSet' with two navigation property, 'MesToLog' and 'MesToKeyfield'. Associate with entityset 'LogSet' and 'KeyfieldSet'.

It's easy to get 'MessageSet' with one navigation property, like: '/MessageSet?$expand=MesToLog' . But how to get 'MessageSet' with two navigation in one time?