水钉的作用，使土钉体外表面与土体界面接触粘结力与摩擦阻力显著降低。
By action of water to nail, Bond between soil and nail a was obviously reduced.
静摩擦力。当物体在表面静止的摩擦力。
The friction used when an object is laying still on a surface.
不要用摩擦性的清洁物处理这个浴缸，因为它会损伤浴缸的表面。
Don't use an abrasive cleaner on the bath, because it may scratch the surface.
不要用摩擦性的清洁物处理这个浴缸，因为它会损伤浴缸的表面。
Don't use an abrasive cleaner on the bath, because it may scratch the surface.
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