Vocabulary consisting only from characters you are able to read
汚す
よごす
(1)to pollute/to contaminate/to soil/to make dirty/to stain/ (2)to disgrace/to dishonour/to dishonor/to defile/(P) godan, jlpt3, verb, vtrans
一次(の)
いちじ(の)
first/primary/linear (equation)/first-orderadj, leda1