21.   The problem was that, even though drafting was critical at DIS, the intense heat made the track surface slippery, which put a premium on handling.

22.   The transmission has economy, sport and winter modes, the latter bypassing first and second gears for better starts on slippery surfaces.

23.   Then again, Apolo Anton Ohno is used to slippery surfaces.

24.   These icy layers not only weaken the snowpack but can serve as slippery surfaces on which slabs of snow that break away on steep slopes can slide.

25.   These lugs, with their scars and their low-key swagger, performed ballet on a very slippery surface, while whacking each other with sticks.

26.   They complained of dangerous turns and a slippery surface.

27.   These systems are particularly useful on slippery surfaces like wet pavement, snowy roads, ice-covered bridges or sandy beaches.

28.   They tend to have a short battery life and slippery writing surfaces.

29.   This icy crust is a slippery surface on which dangerous slabs of snow could slide down steep slopes.

30.   Though running in the cold or rain is not necessarily unhealthy, Burfoot said the extra hours of darkness in the winter and slippery surfaces can pose problems.