报仇
to take revenge; to avenge
薄绸
light silk; silk chiffon
报仇雪耻
to take revenge and erase humiliation (idiom)
报仇雪恨
to take revenge and wipe out a grudge (idiom)
君子报仇,十年不晚
lit. for a nobleman to take revenge, ten years is not too long (idiom); fig. revenge is a dish best served cold
投资报酬率
return on investment; rate of return