Constant wheelchair use will scuff almost any floor surface.
经常有轮椅在地板上走动，几乎任何地板都会有所磨损。
Unlike an ocean wave, a wavefront or surface of constant phase is unobservable and undetectable.
和海浪不同，波阵面或固定相平面是不能观测和不能发现的。
The asteroid is the smooth spherical uniform ball with constant surface albedo.
设小行星是个光滑的规则圆球，表面返照率不变。
The surface cratered with the constant dropping of water.
表面因长年不断地滴水而成坑凹。
So variable charge surface is not a constant potential surface.
所以，可变电荷表面并非恒电位表面。
Surface zone: surface zone is relatively constant and more radiopaque than the other zones.
表层：龋损区表面有一较为完整的表层，且较深层有更强放射阻射。
Surface zone: surface zone is relatively constant and more radiopaque than the other zones.
表层：龋损区表面有一较为完整的表层，且较深层有更强放射阻射。
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