It's important that the grain surface is smooth .

光滑的皮纹面非常重要。

Or it could be made into a dusting powder for fingerprint detection on shiny or patterned surfaces, where normal fingerprint powder is hard to see.

或者可以被制成一剂用于光滑面或图形化表面的指纹检测，普指纹粉在这些表面中很难探测。

The sun might make you ruddier but racing down a " gutter" on a surface slick as " butter" even if you have to " crash" could help you make a " splash" .

或许炙热的阳光会使你烦躁，又或许你需要被“碰擦”了才能引起大家的注意，但你终归需要克服这光滑的槽面，勇敢冲下来。