marking of hull parts

例句：

1. 1. The artist drewa marking on the wall to indicate thespot where he had painted.
   艺术家在墙上画了一个标记，以指示他绘画的位置。
2. 2. The teacher marked the test paper witha red pen for easy identification.
   老师用红笔在试卷上做了标记，以便容易辨认。
3. 3. The conductor marked thetimetable with numbers and arrows tohelp the audience follow the performance.
   指挥家用数字和箭头在时间表上做了标记，帮助观众跟上演出的节奏。