1. With preparation and marking a teacher works 12 hours a day. 一个教师连备课带改作业每天工作12小时。
2. Develop packing, packaging, and marking methods and procedures to protect and control the quality of products and packaging materials. 制定包装、包装材料和标记的方法和程序，以保护和管理产品和包装材料的质量。
3. The vertical line marking each dive, on reaching its greatest depth, began to zigzag in the sawtooth pattern characteristic of blue whales when lunge feeding on krill. 蓝鲸潜水时总是先直线向下，在到达最深处时，就开始以锯齿状路线行进，这是它们突进捕食磷虾时的行动特征。
英英解释
n.
1. a distinguishing symbol
2. a pattern of marks
3. evaluation of performance by assigning a grade or score
4. the act of making a visible mark on a surface
