It's important that the grain surface is smooth .

光纹面非常重。

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.

或者可以制成一种隔离剂用于光面或图形化表面指纹检测，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" .

或许炙热阳光会使你烦躁，又或许你“碰擦”了才能引起大家注意，但你终归克服这光槽面，勇敢冲下来。