1. But this time learning knapped alarm.
而是对自己这段时间的学习敲打警钟。
2. The jigging, floating processing technics: the raw coals were knapped by grade, and then use the jigger to pick out extractive coal, medium coal, and sandy coal.
跳汰、浮选联合工艺流程：入厂原煤被分级粗碎后经跳汰机分选，得到精煤、中煤、矸石三种产品，矸石、中煤经斗式提升机脱水后进入矸石仓、中煤仓。
3. His wife knapped him for lying to her.
他的妻子敲打他，因对她说谎。