As things stand, the biggest unknown is the track surface.
照目前情况来看，最大的未知情况是赛道的表面。
If the track surface skid pollution starts, oil should be clear;
若轨道面有油污造成启动时打滑，应清楚油污；
A smooth surface or track for sliding, usually inclined.
用于滑行的平面或路径，通常是倾斜的。
A smooth surface or track for sliding, usually inclined.
滑面，滑道：用于滑行的平面或路径，通常是倾斜的。
Notice that when you focus below the surface, it is not in focus as a track would be.
注意当你聚焦到表面之下的时候，它不像轨迹那么清晰。
Occasionally they surface at stranger venues, from fencing to swimming, baseball and track and field.
时不时地他们也会出现在一些陌生场地，像击剑、游泳或田径等地。
Bear the load bearing part of the surface for rolling the rolling track.
滚动轴承承受负荷部分的表面，用作滚动体的滚动轨道。
Bear the load bearing part of the surface for rolling the rolling track.
滚动轴承承受负荷部分的表面，用作滚动体的滚动轨道。
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