鐵點污染
Speck \Speck\, v. t. [imp. & p. p. {Specked}; p. pr. & vb. n. {Specking}.] To cause the presence of specks upon or in, especially specks regarded as defects or blemishes; to spot; to speckle; as, paper specked by impurities in the water used in its manufacture. Carnation, purple, azure, or specked with gold. --Milton.