surf A fallen leaf floated on the surface of the water.
surf Being active at night may relate to the behavior of seals, which feed at night on various fish that come up closer to the surface.
surf The seals surface more frequently then, so a bear's chance of catching one at a breathing hole is greater after nightfall.
surf If you always travel by subway, you seldom surface other than at your stop.
These special characteristics explain its preference for still-hunting (lying motionless beside a seals' breathing hole, waiting for one to surface).
This table has a smooth surface.
This beach is a paradise for surfers.
This problem seems to be easy on the surface, but it's really difficult.
I spent my summer vacation there, during which I enjoyed surfing.
The surface of the peculiar object is fairly rough.