The painter said, 「 The black stain in the middle stands for pain.」
画家又说道:“中间的那个黑点儿代表痛苦。
Meanwhile our roaring creek was still at it, but thinner and more quiet now, running from the cliff face itself a mile up the valley in a big black stain I could see in the gray rock.
The influence factors of the surface cleanliness of cold-rolled sheet are introduced and the reasons and composition of the post-annealing black stain and edge carbon are mainly analyzed.
对冷轧板表面清洁度的影响因素进行了综述,并重点探讨了退火黑斑和边缘碳的组成和成因。
The black stain problem in enamelled wires production is systematically discussed.