He is learning to develop the film negatives.他学洗相片.Two negatives make an affirmative.两个否定构成肯定.List the positives and negatives of your choices.列出你的选择的好的和坏的方面....
He is learning to develop the film negatives.他学洗相片.Color positive emulsions basically perform in the same way that color negatives do.彩色正片的彩色再现过程，基本上和彩色负片相同。Two negatives make an affirmative.两个否定构成肯定.In the past we have ...