slight grade

基本解釋

And the content of subnitrate in all vegetable products was in slight pollution (grade 1).
亞硝酸鹽含量均處于輕度污染（1級）；
And the synthetic index of soil pollution was 1.3, which was three grade slight pollution.
調(diào)查區(qū)域土壤的綜合污染指數(shù)為1 .3，達3級為輕度污染。
http://dict.cnki.net
What generally distinguishes "A" grade wood from "AA" grade is the presence of some slight color in the wood and some variation in the uniformity of texture.
級和AA級木材的區(qū)別在于： A級木材存在一些顏色的輕微變化，木材結(jié)構(gòu)的均勻度有一些變化。
blog.sina.com.cn

The investment grade rated bond eventually sold at a slight discount from par and fetched a yield of 4.5%, over 250 basis points over 10 year U.S. Treasury bonds.
FORBES: Investors Get 4.5% Yield On Brazil's Vale Bonds