1.Spilt acid discolored the floor.

1.泼酸弄得地板褪色。

2.This kind of identity in the absence of argillitization of inmnersion or humid air gas, such as El isochronic, the edges of the clear picture and text will not fade, discolor.

2.这种标识在没有遇水浸或潮湿气体，如哈气等时，图文边缘清晰，色、变色。